Honestly, this is the first time I've ever heard the words "godawful" and "Shawshank Redemption" in one sentence. We got ourselves a movie hipster, here.
This is why we need curated lists like the AFI's top 100. I'm not saying they are the answer rather what I'm saying is truly reflective lists require critical thinking and evaluation.
Have you tried out Criticker [1]? Its recommendations are based on your previous scores and the scores of other members. The recommendations and the probable scores are very spot on.
I think you and I are in a pretty small minority. Maybe it's because I'd already read the novel - but I walked out of Shawshank Redemption thinking "meh" - and discovered I was very, very alone in that perspective.