Overall, I still think the animated series is the best protrayal of the character. So I gotta give major props to Kevin Conroy.
I think Bale has by far the best grasp on the character. Some aspects of Bale's portrayal are a bit odd(the voice), but I think overall he understands the character far better than anyone else that has played it.
There are aspects of Keaton I quite liked. I think Batman 89 only worked to the dgree it did because of Keaton. It certainly wasn't because of Tim Burton's understanding of the character.
Adam west was...well, that show was the reason I got into Batman. The camp aspect doesn't do it for me today, but for millions West is, was, and will forever be the Caped Crusader. But West is by no means the Dark Knight.
Clooney I still think could have been decent had anyone cared about the film beyond toy tie ins. Sadly we'll never know.
Kilmer. Hated him. Just hated him. There seemed to be no difference between his Bruce Wayne and his Batman. It was just the clothes he happened to be wearing at the time. Batman Forever is by far my least favorite Batman film ever made.
“The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence.” ― Charles Bukowski