Much like every enthusiastic movie fan has a favorite actor who's played James Bond, most people have a favorite Batman. It's usually Adam West, Michael Keaton, or Christian Bale. We're fairly sure that there's no-one out there who prefers the interpretation of the character that George Clooney gave to us - and we include George Clooney in that statement.
'Batman & Robin' is legendarily bad, and regularly turns up on 'worst movie of all time' lists. Given the script he was faced with, we don't think any of the other 'Batman' stars could have done any better with the material, so we don't blame Clooney. The one-time 'ER' star has apologized for his part in the film on many occasions, and was glad when Bale as cast in a rebooted series of films, as until then he was worried he'd permanently destroyed the character!