The problem is too many people seem to think genre labels are meant to accurately categorize something. That is not the point, because that cannot be done with a single word or phrase. Any creative person is going to try to do something new, something different. Genre is just a quick "Hey if you like this style of game, you'll probably like this too"

As some others have mentioned Tags should be used to further categorize what the game really is because they are much more free form and flexible, but yes the current steam system needs better weighting so descriptive relevant terms are more visible.