Either these shows are too bad or too long to finish.

Will not finish Rating Comment
Baki the Grappler (TV) I saw the first two episodes with Comcast On Demand. I thought it was entertaining to watch some punk teenager who's trains every waking hour with fighting try to take on first one hundred guys then try to takeout the world heavyweight champion. It looks to be a very interesting show.
Bible Black (OAV) Worst ever I heard this thing had an interesting plot and it was used as a torture device in one of my favorite games: Liberal Crime Squad. Here's how it went down. So I start it up... human sacrifice.... oh everyone's naked. Scene ends. Ok that was wierd. Regular school scene, two minutes later a female teacher is saducing a female student when suddenly she turns out to be a hermaphrodite.... stop. Delete, delete, delete. Where's that shredder program? Yes, I only made it 4 minutes before screaming my head off and throwing the show into the abyss from whence it came. Don't watch this show!
Bleach (TV) Decent I was watching this series regularly on adult swim and following along in the manga. I kept with it even though it continued at a horribly slow pace, 30-40 characters were introduced unnecesarily and the plot dragged on and on. I missed a few weeks and I come back to see a filler episode where the main characters are in a haunted house. I watched for a minute, turned the TV off, then never went back.
Buso Renkin (TV) I watched some of this because I like the manga and want to support Watsuki's works. Unfortunately, this anime didn't seem to capture the same ethos of the manga, for whatever reason. It was ok, but not what I was hoping for.
Cardcaptor Sakura (TV) I went through a major CLAMP phase. While I still enjoy a lot of their work, I can't finish this. I probably would have enjoyed it if I was younger. I have no major complaints about it.
Chō Denji Machine Voltes V (TV) This was aparently popular in the Philippines. I don't really want to see the whole thing, just watched a few to see what it was all about. More of a kid's show than anything.
Code Geass: Lelouch of the Rebellion R2 (TV) Not really good I've written an entire essay about why this show sucks. Suffice to say it is one of the worst pieces of crap I've ever had the misfortune of watching.
Digimon Adventure (TV) Decent
Eiken (OAV) Awful This series has two episodes, the series doen't follow the plot of the manga AT ALL; and turns it into some timid young teenage guy being thrust into awkward situations with girls every 3 seconds. I saw episode 1, I will not see episode 2.
Final Fantasy: Unlimited (TV) I want to like this, because it has the name Final Fantasy stamped on it. But the three times I've tried to watch it, I haven't been able to get past the first episode. Just a weird show with bland protagonists.
Getbackers (TV) Good A solid anime series up until they run out of plot and are forced to stretch 1-2 episode's worth of plot over several episodes. A bit disappointing. After reading a bit further in the manga, I found out that the big reveal at the end is just something really stupid. Couldn't force myself to finish and have long since banished the plot from my brain. I still like the characters though.
Guilty Crown (TV) I've learned my lesson about series composed by Hiroyuki Yoshino from Code Gaess and Macross Frontier. I'm not going to make that mistake a third time. That man doesn't have an original bone in his body.
High School of the Dead (TV) Not really good Excessive fanservice. Little plot. Quit after 5 episodes.
Initial D (TV) This show is great, if you're a 14 year-old guy, or someone who is really obcessed with cars. I can't see watching too much of this.
Inuyasha (TV) So-so I can't even make myself watch this show, I've seen a couple episodes. For one, it just goes on and on; the english voice actors are horrible; and the plot is pretty generic and bland.
Kill la Kill (TV) Awful I gave this one the five episode test and had to reject it. While I thought their previous series Gurren Lagaan was ok; this was putrid. I honestly have not hated a show this much in a long time. "Fan service" bordered on pornographic, humor was juvenile and unfunny. Setting sucked. Characters sucked. First five episodes did a horrible job of introducing the series. While fans advertise the show as "over-the-top" I didn't see it that way; it just is sloppy ADD storytelling. I don't care how good the further episodes are, a show that can't draw you in within five episodes is not worth watching.
Kirby: Right Back At Ya! (TV) This show was fun, but not worth seeing all 100 episodes
Kyatto-Ninden Teyandee (TV) Bad This used to be on really early in the morning. I hated it then, I hate it now. lol
Loveless (TV) So-so Ok, I saw the first episode of this. The main character has the voice of Shugo from .hack//twilight (japanese). But when some random guy who looks to be in his 30's shows up out of nowhere and starts kissing the protagonist (a boy in his early teens); the show just became almost unwatchable... awkward. (I might give the show another chance, but it would have to be a dang good 2nd episode)
(The) Melancholy of Haruhi Suzumiya (TV 2009 renewal) Glad to see more episodes, but I don't understand why they decided to broadcast eight nearly-identical episodes. I'm not amused.
Pokémon (TV) Decent Great to watch now and then for nostalgia's sake, but probably will never seriously revisit this series.
RahXephon (TV) This appeared to be an Evangelion clone and didn't seem to bring anything new to the typical teenager-piloting-mechs plot.
Ranma ½ (TV) Good Interesting show about a guy that turns into a girl when he comes in contact with cold water. This is from the creator of Inuyasha, so the show just rambles on with no point; but its hilarious to watch
Rozen Maiden: Träumend (TV) This is an interesting show. This kid doesn't go to school and somehow gets away with it. These dolls show up and start bossing him around. I think the target audience is elementary school age, but I still like it.
Shaman King (TV) I saw one episode, it looked interesting, but not sure its worth following up on
Shigurui: Death Frenzy (TV) Bad Too trippy. Literally seemed to be told from the perspective of someone who was high on hallucinogenic drugs.
Those Who Hunt Elves (TV) I watched this one on a dare. We wanted to find the absolute most random anime possible, and for some reason we were able to find an episode of this. I might watch more.
Vandread (TV) In a universe where men and women separated as species when they began colonizing the galaxy. Suddenly several male characters find themselves stranded on a strange ship along with a female pirate crew. While it has all the weirdness and jokes you would expect with this premise, so far its at least been entertaining. Nothing so far that I would say I'm embarrassed to have watched. This show is still in its probationary period for me though.
Yakitate!! Japan (TV) So-so This is an anime about baking bread. After a few attempts, I couldn't get going on this one. It just seems too silly.
Yu Yu Hakusho: Ghost Files (TV) I love the dub of this and would like to pick it up again. However it does appear to fall into that monster-of-the-week format. I'm hoping I'm wrong, because the cast is pretty good.
Zatch Bell (TV) Decent Was watching this regularly on Cartoon Network until my work schedule began to interfere and I fell behind - this was a few years ago when it was harder to watch shows online. From what I remember, this was a pretty fun show. Though it tended toward a Pokemon-type format, traveling around and seeing the varieties of Momodos (what I would describe as a humanoid Pokemon) and participating in various battles of predictable combinations. Nevertheless, I had fun watching it, the characters were rather simple, but well developed and it had some funny running gags. I would definitely recommend it for kids, but not probably not many adults would enjoy this.