I don't care about ratings -- IMDB, Rotten Tomatoes, or random film critic -- it doesn't matter. They're all useless to me (often worse than useless, as so many people have such different tastes from me).
The only people who's opinions I care about are friends and family who I know well and who's tastes I share, or who at least know my tastes and can recommend to me something they think I might like.
Apart from that, what I do to find more films to watch is try to see what other films directors and writers I like have made, or do web searches for combinations of films that I like to see what similar films turn up or to occasionally find people with similar tastes to my own and then pick through their favorite movie lists.