Reminds me of SF writer Sturgeon's "Sturgeon's Law": "ninety percent of everything is crap."
http://en.wikipedia.org/wiki/Sturgeon%27s_Law
High quality is not the only variable in success, as we have seen things in the market where it's clear lesser or bad quality sometimes wins over good - high quality is no guarantee - but good quality I think will lead, in general, to higher probability of winning, especially on the games market.