Spider-Man
I think what makes this flick so perfect is that it feels like a movie. Like a real movie, and it doesn't present the same manufactured feeling all superhero movies have today.
This is an adaptation made with love, and takes liberties with its characters and finds itself capable of blending it's comic book cheese with a balanced and emotional story.
The characters are fleshed out perfectly and there are tons of quotable lines. Plus subtle details that are easily overlooked and can be expanded upon. The music adds a significant amount of muscle to each scene as well.
Peter is the definition of geek, while also being a well written teenager. MJ is more than just a love interest and damsel, she has strength and personality. Along with ambition and strive. Harry is self-conscious, co-dependent and lost. Then Norman, the ultimate villain that has that bittersweet character arc. A caring father, who attempts to tackle both business and relationships while also corrupted by the Goblin.
Its a wonderful proving ground for a Trilogy of films that only grows stronger in the second, but collapses by the third. Spider-Man is just a wonderful reminder of how great movies can be, even when adapted from a comic book that inspired millions.