For some reason, I've seen nearly all the big summer movies this year.
Of all the movies, the one I found most entertaining and satisfying is Pineapple Express. Some of the reviewers were lukewarm on it, but I liked it better than most of them. Great mix of reality, absurdity, and action.
This movie is like Apatow meets Tarantino meets the Shaun of the Dead/Hot Fuzz guys. Seth Rogen is fantastic, but in this movie he's almost outshone by a couple of other actors, the two guys shown with him in the movie poster.
All the other movies this summer have left me a little dissatisfied, but not this one. Even Dark Knight was a little too long and complicated and overstuffed for my taste, especially toward the end.
However, I don't recommend you see Pineapple Express unless you're already a fan of Apatow and/or Tarantino movies. Let's just say that it's rated R for good reason.