I'm still torn on the ranking of Clooney. I feel like he clearly got the worst movie, but on the other hand, his casting is far closer to the comic's depiction of a "handsome, millionaire playboy who has a weird side". And though Keaton was probably the biggest Batman impact in my lifetime, I still remember "fans" bitching and moaning about his casting because he was kinda short, not traditionally handsome, and known for comedies. But like
@mikerc said, he was given a Burton Batmovie that he perfectly fit the aesthetic.
I think I'm going to rank mine on their lasting impact on the role, and how they make people see/hear Batman, rather than the movies:
Conroy
Keaton
West
Arnett
Bale
Affleck
Clooney & Kilmer- honestly, both were forgettable, but Clooney get the edge for "Batnipples", which is still an infamous reference