What was fun about watching Nick (Jesse Eisenberg) and Chet (Aziz Ansari) together was their strong chemistry as friends. You can believe that these guys actually care about each other. You can also understand why Chet would be fed up with the listless Nick (a much darker, more depressive character than the sunny one played by Eisenberg in Zombieland).
Anyway, the two pairs of buddies get caught up in bad plans and much posturing and all hell breaks loose, only to be very neatly wrapped up with an acute moral sense. The whole tone of the movie captures the vulnerability and testosterone of male adolescence very well, even though the characters are older than that. Like the likable losers of Step-Brothers these four guys have somehow managed to squeak through their thirties without much being demanded of them. However, when the rubber meets the road, they are loyal to their friends. Men around the world who have much more complicated lives will breath a sigh of relief.