I saw Paul Blart: Mall Cop in the theater. I thought it was really funny. I didn't think the script was all that good, but the movie was elevated to the funny by the performance of the lead actor who was 100% comedy. And man, it made lots of money at the box office.
Observe and Report. Not so much money at the box office. Not as funny. But from the perspective of cinema, and the telling of a story, there is no comparison. Observe & Report tread artfully on a thin line between dark social commentary and dark comedy. The characters had depth and their world was morbidly fascinating. Not a Disney movie, nope.
Ten years from now, if there is still such a thing as Blockbuster, I might be standing next to someone looking for a movie to rent from in the Seth Rogen section. Chances are, Observe and Report will be one of the ones they missed. I'll be the guy insisting they watch that one.