Superhero sequels typically surpass the original films. A reason for this is that the first movie is obligated to devote a significant amount of time to developing the hero’s backstory. In comic books — the stories these movies are based off — the hero’s origin isn’t constantly being retold. Once the base is built, the stories become more interesting and the character’s build up more nuance. This is plainly obvious in Spider-Man 2. The tension between Peter and his best friend Harry — and their alter-egos — is palpable, and Alfred Molina’s portrayal of Dr. Otto Octavius is arguably the best performance of any villain in the Spider-Man films.
Image Source: Hollywood Outbreak