IMDB is the go-to destination for checking out a movie. But before you decide to skip that movie with the 5.5/10 rating, check the voter demographic. You might be in for a surprise.
The voter demographic breaks down the rating based on male and female voters, age, US and non-US voters, top 1000 voters, and IMDB staff itself. You also get a breakdown of how many people gave it a 10, how many gave it a one, and so on. It's a much clearer idea of what people like you think of the movie, even if the overall rating might denote something else.
To access the demographic, click the total number of users noted under any rating on IMDB. The following page gives you the details you need.