I just saw Clerks II, and I wish I hadn't.
There are funny parts, but Kevin Smith seems to think that being obscene is either funny, or a goal in its own right. So we have a movie that often offends without humour. It's like going into a sewer for a free baseball cap: you get a cap, but it wasn't worth it, not by a long shot.
I know you're going to want to go, and I'm not going to change your mind. Therefore, let me say, "I told you so" before hand.