Studio Ghibli was founded by Hayao Miyazaki and Isao Takahata. Both geniuses, but unfortunately most people don't recognize Takahata's name. I'll give you a hint. Grave of the Fireflies and Future Boy Conan. Recognize it now?

Not all of these were directed by Miyazaki or Takahata (though almost all were), but all of these were worked on by one or the other ie. storyboarding, character designs, animation etc.

Miyazaki/Takahata Works Rating
Castle in the Sky (movie) Masterpiece
(The) Cat Returns (movie) Good
Grave of the Fireflies (movie) Masterpiece
Howl's Moving Castle (movie) Decent
Kiki's Delivery Service (movie) Excellent
Little Norse Prince Valiant (movie) Good
Lupin III: The Castle of Cagliostro (movie) Excellent
My Neighbor Totoro (movie) Very good
Nadia - The Secret of Blue Water (TV) Very good
Nausicaä of the Valley of the Wind (movie) Masterpiece
On Your Mark (movie) Good
Panda! Go, Panda! (movie) Decent
Panda! Go, Panda!: Rainy Day Circus (movie) Decent
Pom Poko (movie) Very good
Ponyo on the Cliff by the Sea (movie) Very good
Porco Rosso (movie) Excellent
Princess Mononoke (movie) Masterpiece
(The) Secret World of Arrietty (movie) Good
Sora Iro no Tane (special) Good
Spirited Away (movie) Masterpiece
Tales from Earthsea (movie) Good
Whisper of the Heart (movie) Very good