It's tough playing a hero on screen who wears skin tight clothes, and beats up bad guys. As an actor you take a big risk with your career playing these characters. If the movie is a flop, you come across as ridiculous. Ask Val Kilmer, and George Clooney how they feel about their portrails of The Dark Knight.
In an interview with ShortList, Michael Keaton acknowledged the current state of the caped crusader, and his pride for he and Tim Burton's work on the 1980's and 90's early Batman movies:
Tim changed, or started, everything. And I’m proud of the choice I made, in terms of how to play Batman. It’s probably easier now because Tim paved the way, and if I did anything to pave the way, I’m proud of that, too.
You can step into it more easily now, is my guess. Technically, [superhero movies] do everything for you. They create a world where all you’ve basically got to do is show up, not f*ck it up too much and you’ll come off OK.
Keaton was also asked if he shared Christian Bale's envy of Affleck's casting as the Dark Knight in ' [Batman v. Superman: Dawn of Justice](movie:711870).' Bale said:
"Stopped and stared into nothing for a half an hour"
Keaton's response was quite better:
No. Do you know why? Because I’m Batman. I’m very secure in that.