When you start getting into 60s and below, it generally says a game is pretty awful and it would be harsh to label these ten so unfairly
That's the point I would argue. 60% shouldn't mean "awful" to me. If all so-so games make it to 70% and above, it gets much harder to differentiate quality. It means there's a huge section of your percentage range that never gets used, if a truly dreadful title can still score, say, 50%.
It's all down to where you set the average point, IMO, and I would say that if you establish "average" at 50%, and make that clear to readers, then you can differentiate between "misses the mark", "average", "good but nothing amazing", "recommended", "excellent", etc with appropriate scores.
There are games I've thoroughly enjoyed that earn 70% on MC, and truly dreadful stuff that earns exactly the same mark*. I just think that too many reviewers hover around this upper scale. The perception within the gaming community (not the reviewer's fault by any means) is that anything below 7/10 is shit, and that really makes no sense to me. It certainly isn't that way with other media, such as films. (Jim Sterling probably makes this argument far better than I'm doing.)
*OK, OK, Metacritic arguments aside. I know a lot of reviews, especially for movie-licenced games, are *ahem* sponsored.