Keaton had great eyes in the suit and pulled off the coldness and style of Batman well. His Bruce was awkward in I'm-rich-and-have-people-do-things-for-me way. Funny.
Kilmer had a great voice, but his body was looking terrible in the topless shot.
Clooney is a cool guy, but his Batman had too much weird homoerotic stuff going on to sell me on it.
Bale is the kind of actor that does such outlandish roles that it's hard to judge him. His Batman is okay, but doesn't do anything positively or negatively for me. He doesn't bring anything new to the role.
In the end, it's a combo of director, writer, and actor that makes the Batman character great. Burton/Hamm/Keaton FTW.