I gave up on rating games with numbers. I mean, how can you compare ELEX, a game made by 29 people, to similar games made by teams 5 times the size (or more) of PB, and still use the same rating scale? That doesn't compute to me.
Also, ELEX technically has lower production values, is not as polished as the bigger dev games (relatively speaking it's excellently polished, but again, that is relative), and more. For what it DOES accomplish, it's amazing. And for the cost and team size, how do you factor that in?
I'll leave that to smart cats like @Maylander; and I'll just enjoy the games.
And occasionally take useful bits from user reviews who just leave Positive or Negative as a rating (which is a much better system, IMO.)