I've just got back from watching it. I wasn't expecting to like it if i'm being honest, but it did surprise me by being pretty good. It wasn't "amazing" by any stretch of the imagination though, and i think people expecting this to be the next 'Fight Club' (i.e. make a mint on DVD/Blu Ray after flopping at the box office) will be in for a disappointment as it's very much a cult film, aimed squarely at a certain type of person, definitely not something that was ever intended to be mainstream. The only bit i really didn't like was the cringeworthy bit where Evil Ex #1 started singing, i actually shuddered...
Overall though i did enjoy it.
And for the record, i much prefer Kick Ass in terms of this years "geek films".