Akira was hands down, the best animation feature fully-drawn by hand, ever... in terms of quality and artwork. Katsuhiro Otomo's masterpiece had a very unique style of artwork, clean, crisp lines and animation (no shortcuts anywhere) and a custom color palette that they developed just for the film.
Best to watch it on a friend's widescreen... with a powerful sound system, because the music just plain rocks (used to have the Laserdisc (yes,
laserdisc, I am old!

) and the soundtrack).
I think Steamboy disappointed people who aren't used to old-school Japanese style pacing... the long, slow, drawn out plots and situations (and yes, the thirty minute long apocalyptic ending), but I loved it. And like "Akira", it does have a motorbike chase scene, of sorts.
For those who like Hayao Miyazaki's work: Princess Mononoke, Spirited Away and Grave of Butterflies, try to find Princess Nausicaa of the Valley, one of his early movies. It's pretty old, but the action sequences and artwork are good (considering the film's age), and the story is pretty good as well. Too bad the English-dubbed version (very professional job, by the way) chopped the story to pieces.