For the non-Star Wars fan:
Unless you grew up with a Star Wars fan, knew a Star Wars fan, or used to beat up a Star Wars fan, this movie isn't for you. There isn't enough outside the geek genre to keep you in your seat, and besides, all of the geeks sitting next to you are going to be laughing at stuff that you have no idea about, which will probably anger you and make you want to beat up one of them like you used to do in high school, so to save a fanboy a severe beating and horrible flashbacks to the 9th grade go see Friday the 13th. I am sure those fans are more your speed.
For the Star Wars fan:
If you know what kind of ship Luke used to fly when he was "bullseyeing womp rats," then you are going to enjoy this movie. Even if you don't (it was a T-16) if you have been exposed to the Star Wars fanboy culture then you will be fine.
I am not going to give you a cinematic synopsis and go into detail about the production value, cinematography, score, etc. This isn't that kind of movie. This is the kind of movie that kicks in the flux capacitor and sends you screaming at 88 mph straight back to 1998 to hang out with a couple of guys (and a really hot girl who in NO WAY would ever be hangin' with this crowd - suspension of disbelief my ass) who were either friends of yours or someone you knew. Between the numerous cameos (yes, that is Ray Park by the way- thanks for confirming that George) and endless Star Wars/Star Trek/comic book/geek references and jokes, you will be smiling and laughing through the whole movie. The odd thing is, while you are smiling and laughing part of you will want to keep it under control for fear that someone close will recognize you for who you are and want to nail you with a milk dud. Don't worry though; let it out. Everyone else around you is feeling the same thing. Once you let your inner geek out you will enjoy this movie a whole lot more.
Dan Fogler is quickly becoming a favorite (do yourself a favor and see Balls of Fury), Kristen Bell stole every scene she was in (she is the girl every fanboy dreams of - smart, funny, HOT, reads comics, knows her Star Wars, ahhhhhh..... of course the existence of such a Geek Queen has yet to be proven) and Jay Baruchel embodies the hapless, complete Star Wars geek we all once knew (or were). My only question: What was up with the Uniball!?!?!
I judge the quality of entertainment from a movie by the number of times I look at my watch during the film.
4 looks or more = stinker, go for popcorn, don't come back
3 looks = the movie should have ended long ago
2 looks= not bad, not great, but not bad
1 look = good movie
No looks = must see
Fanboys is a no look movie. See it.