the advtage the steam system has is first the bought game/gifted game situation, as well as the more important factor, the recent opinion score, as at amy given momemt a game can get good because of a major change (e. g payday 2 reverting all the pay 2 win content the original publisher mandated) or gone to shit because of greed or a bad patch.
the problem users have is finding a curator that has a similar taste in games that they do. If I was a fan of JRPGs, im not going to care about the opinion on some person who doesnt really play jrpgs. at the same time, if you like some niche genre, to the general public, that niche is always less popular, so itll get worse ratings thanit should compared to people who enjoy said niche.