I don't know... to be honest, I think people get a little too hung up on dialogue in movies. Granted, there are movies with AWFUL dialogue, but sometimes I seriously wonder what fans expect characters in movies to say. Screenwriters have a tough enough job as it is, trying to make characters' speech feel natural while not making it boring. I think the Internet as a whole has blown up the concept of "bad dialogue" to epic proportions.
It's like with James Cameron's movies. Now, I'm not the biggest Cameron fan, but people who hate him and trash his films (usually before they even watch them), say all the dialogue in his movies is "crap." I don't know... yeah, there are some bad lines here and there, but you can find that in any movie. You can find bad lines in The Dark Knight. You can find bad lines in Casablanca. In Gone With the Wind.
So maybe their comments about the film's dialogue are spot on, but I'll wait and see. Until I hear Clu or Sam say "Mesa day startin pretty okee-day with a brisky morning munchy," I'm not going to panic.