He bitches about Batman in general since he doesn't like a lot of the writing around the character.
Batman is a lot like early Spiderman, it would be very easy for him to cross that line and become the villain. He's a vigilante using violence to deal with his issues surrounding the death of his parents, and his public persona is just a mask to steer people away from thinking Bruce Wayne is the Bat. As such, the best parts of his rogues gallery all are somewhat twisted reflections of himself. TKJ reveals that the Joker sprang into being from suffering one horrible day, similar to the night Batman's parents were killed being the defining night of Bruce's life, and hinting that Batman could have been the Joker if things had been a little different. And hell, Batman coming to blows with other heroes over ideological differences brings to mind different interpretations of what justice actually is. Batman is the hero who is always toeing that line, and may sometimes cross it in the name of the greater good.
Or because of his paranoia.
From what I've seen, Dobson doesn't like this. He doesn't want Bats to be this character that leaves you questioning whether he's doing the right thing, he wants Batman to be the hero you believe in. He likes the simpler versions of the character, with TAS Bats as his personal favorite. Hell, has he ever commented on the Justice League cartoon? Everything that makes Batman so popular, all the work writers like Nolan, Miller and Moore have done to examine what makes the SOB work, that's wrong because it makes Batman evil in Dobson's book.
The guy can only handle some basic level versions of morality. Anything above Good Guys and Bad Guys is completely outside of his grasp.