IMDB no, I do however look at RottenTomatoes to see how a film went down with critics and audiences if I'm trying to pick between films to pay for on a Saturday night for.
This only tends to be an issue for those middle of the road films that I haven't heard of, as I tend to have a good memory for films that were highly praised on release (e.g. Source Code) and those that were completely slated (e.g. The Tourist).
My IMDB app is however always to hand for those "What was she in?"
moments during a film.