The voice acting is fairly terrible, if I'm honest. I could do a more convincing Batman, and I'm Scottish.
EDIT: @k4tzm4n I'm aware that it's Kevin Conroy, but that doesn't make him impervious to criticism. I'll concede, however, that it may be the fault of the script, rather than the actor. 'Superman! Don't!', for example, just makes me cringe. It's not Batman.
You have a right to criticism, but keep in mind the sheer amount of fans built over decades that'll react harshly to negative criticism. The Internet can be a scary place for negative criticism.