I don't think I agree with this. There absolutely are undeserved genres where good games are a rarity, but indie game market as a whole is viciously competitive. Even if you take out everything rated less than very positive, that's still a huge number of games. People are habitually buying more games than they need or can use (the backlog phenomenon) just because there's so many available and, with how competitive the market is, they're usually very cheap. My backlog isn't all mid-tier 2D platformers, it's full of top notch games like Satellite Reign, This War of Mine, and Kentucky Route Zero. Games which I may never actually play.
Obviously not every potential player has to buy your game for it to be a success, but we've created a market that is selling people products they won't realistically use justified solely by the fact that cheap games are still novel to those of us who grew up in the 90's. That isn't sustainable. And I think if we keep pushing down that road, we're going to run into mass consumer burnout. You could argue the first threads of that are already here.
For me personally, it's become increasing difficult to justify buying indie games even though I love indie games and the indie game scene. Most of my purchases are to support the art rather than to play the game itself. There are more video games in my library than I will likely play in the rest of my life. How is anyone supposed to compete with that? Even people without massive Steam accounts are apt to have 20 great games they haven't touched at a given time. Having a large pile of content at any given time makes the decision to wait for a sale trivial. Buying a game at launch is an actively irrational decision when it will be discounted long before you ever play it. Acquiring players in that hyper-competitive market requires an emotional investment, not just interest in the game itself, and there's only so much of that to go around. Again, I think this is unsustainable.
Call it what you want but if you think that there isn't strong competition between high quality games right now, you're in denial.