No offence but how can a mediocre player review a game and point out mistakes xD.
Reviews are merely the opinions of one player to other players, better or worse than themselves; Also, I enjoy to give more than a Wub or a derogatory comment alone when I have the leisure time to watch a replay all the way through without pressing the F key every few seconds, it'd be fun if other people would leave a few comments on what they thought of a replay they watched and enjoyed(or hated), it would have a very positive effect on a lot of us mediocre players who still upload.