You know, even now, I don't think I know what this movie was about. The whole time I was watching the insanity within unfold, I was jumping from hating to liking Seth Rogen's character, always wondering where the heck all of this was going. The answer is never really given, and we are instead shown a cheesy happy Hollywood ending. I was kind of thrown off, since I had come to expect something totally random, much like the rest of the movie. I guess, then, that this is simply the portrayal of a totally delusional, self-obsessed and hand-to-hand combat expert mall cop.
If I had to pick a theory, it would be that the movie parodies films where the loser underdog main character manages to save everybody through a series of coincidences and blunders, by showing what would actually happen to such an overconfident character in real life. With that mindset, this film is actually quite brilliant, with the exception of the ending. The skill and style that is clearly apparent in the cinematography, editing and acting leads me to believe this might actually be what the filmmakers intended. Either way, seeing the movie this way makes it somewhat brilliant, and definitely worth watching as long as you expect insanity.
In a sentence:
If you see it as a portrayal of what would happen if a cliché overoptimistic underdog loser character tried to save everyone in real life, this is pretty brilliant and well-crafted film... until the lame ending.