Like Gigli, Jersey Girl suffered unfairly at the box office because of the whole Bennifer thing. I liked a couple of Kevin Smith's previous films but the poor acting always bothered the heck out of me (I think he and George Lucas have a similar tendency to treat actors as props (but in different ways)), but the acting in Jersey Girl was surprisingly good. And the kid in the movie was great. Like most movie children, she was a bit precocious and interacted with the rest of the characters as if she were an adult, but it worked because she was essentially standing in for her mother in the eyes of Affleck's character. Affleck has his moments as well...he can be a surprisingly good actor when he wants to be.
