Like the first part, I thought it had it's moments. But much like with the Watchmen movie, it felt to me like something got a bit lost in the translation. They played things way too straight, and much of the dark and subversive 80s satire of the comic just didn't come through very well (especially when it came to the Reagan and USSR stuff). It all just seemed very odd and bizarre. And plus it was long and bloated as hell.
Although I admit the showdown between Batman and Joker was pretty good.
RT, a lot of the stuff doesn't translate well.