One guys "crap" is another guys entertainment.
I use IMDB to check the ratings of a movie I want to see (in my defense, I am old) and if a movie has a 6.5+ rate I consider it worth of my money and time. But more than that, I always check the ratings distribution and the ratings in my demographics, they are much better than just an average.
To give an example, Twilight has a rating 5.2, but almost 30% of the ratings are either 1 or 10, so I know this is a "love-it-or-hate-it" movie. In my demographics, the average is 4.9, while for "Females under 18" it is 6.6, so I know this movie is not for me.
Terminator 2: Judgement Day, on the other side, has the ratings describing a normal curve peaking on 9, and an average of 8.7 in my demographics (the highest of all), so this movie is right for me.