Depends on your perspective, really. If you believe in the idea that game developers generally don't want to spend all their time and energy consciously releasing a product that they know is horrible, you end up mostly with a bunch of games (that were popular enough for reviewers to consider scoring for clicks) that score around 6 through 10.

When we're talking about products that take hours to process and are generally more expensive to consume than other mediums like movies and books, a 6/10 game is just gonna seem less appealing at a glance than one that's at least 8/10. This isn't to say that people should avoid the 6 or 7s as generally, that's also a score given to relatively niche games without broad audience appeal.