re: Which actor was the best in protraying each superhero?

For Superman:
Tom Welling

This was the first in what has become the popular "re-telling"/"Re-imagining" of superhero and I thought it was unique.

For Batman:
Kevin Conroy

Sure, maybe the animators helped, but damn if Conroy didn't nail every subtle nuance of what Batman is

For Spiderman, your choices are
Andrew Garfield

Toby M was a better Peter Parker, but Garfield moved more like Spidey and looked more like the lanky hero I grew up reading

For Hulk:
Edward Norton

I hated that he did not stay with the role. Would've loved to have seen his take on the role in The Avengers movies