I thought Jersey Girl was okay. He worked on Good Will Hunting too.
My favorite Kevin Smith movie (this answer is such a cop-out) depends on my mood. I think Dogma is a great movie, but for goofy laughs, nothing beats Jay and Silent Bob Strike Back. Of course, these movies wouldn't be half as good unless you've seen the previous films.
I guess Mall Rats gets the "worst" rating in my book, but I like seeing the cast of My Name is Earl on the big screen!