The market actually ignores 90% of what's on the market. During the great Doom and Quake phase, 90% of what came out were just rehashed copies of those games. None sold well if at all. The gaming industry may be a billion dollar or more a year industry, but it has also gone through a lot of turmoil and consolidation in the past 10 years.

People want a game that looks good, has a decent story, and easy controls to learn. Games that don't implement those things are usually doomed to failure.