One person's Schindler's List is another person's Bad Taste. Like reading wine scores, you'll find there are particular reviewers that you agree with and those you don't. When looking at reviews of games you've enjoyed, find the reviewers that agree with you in terms of both score and analysis. Fall back on those gamers for reviews. It's not always possible -- many gaming sites have different people review games, there is staff turnover, etc.
The score will give you a general idea of whether the game is rubbish or not. Scores of 5 or below generally mean it has bugs or serious gameplay issues, regardless of whether it's fun. Scores of 9 and above mean that the reviewer truly believes it's a great game for its genre. Scores between 5 and 9 are subjective and worth reading the analysis.
But you know, it's all subjective. I loved the Dragon Age games -- but Inquisition...it's just too much right now despite the rave reviews. Meh. Shadow of Mordor was the right game for me at the time.