I went into it half-expecting to not like it, but I really liked it.
The trailers portrayed it all as too sullen for my tastes, and it is a pretty sombre film, but artfully so, I think.
I really liked how when Pattinson's Batman isn't fighting, he's slow, methodical, and non-reactive (he barely reacts to criticism or threats, for instance).
The movie doesn't stress this, but there's a strong thread in there about the man who was a traumatized boy searching desperately for a way to help another traumatized boy, and how events move him from wanting to help that boy to wanting to help everyone. He goes from a closed-off obsessiveness to a more open acceptance that really transform the way he approaches things. He'll be a better Batman for it.