Nick and Norah's Infinite Playlist is the sort of film where there is a clear divide in what I liked about it and what I didn't.
My main criticism of the movie is it feels like it's trying just to hard to be cool and hip, the bands that get named even Nick's band are supposed to show you how cool these people are, and I think it's certainly a negative of the movie that brings it down a notch or two.
To be fair, though there is enough positives in this - Nick (Michael Cera) and Norah (Kat Dennings) at least have a relationship in which you can sort of care if they get together, there's also decent support from Ari Graynor who finds herself in misadventure after misadventure mostly in thanks to her constant intoxicated state.
I don't think it's the most memorable movie, I can say liked it but only remember certain bits of it - Graynor retrieving gum from a toilet is one stand out scene - so I would probably file it under not the worst way to kill a couple of hours but I'm going to struggle in conversation later besides a few words.
Overall, a short write up befitting of a film that's quick to put out of the memory so quickly, enough to recommend about it that you should sit and watch but I'll be very surprised if you'd be calling this your favourite film after watching it.