It was pretty good IMO. Seth Rogan,James Franco and the other guy have good chemistiry. It's one of the few pothead movies that's not really overated. That's because as is typical with Judd Apataw,Set Rogan etc type of movies they have alot of heart and characters you like. What makes them so likeable IMO is how sensitive and emotionally vunerable they are which makes them seem really human. The action scenes are mostly well done as well because it's not a bunch of stock action hero types doing the fighting. Especially the fight between Rogan/Franco and the other guy in said guys apartment.
The few things I didn't like were the Hitman characters. The actor who plays Darryl on "The Office" was especially bad which surprised me because he is so good on that show. I also thought the action stuff went on to long towards the end.