I think genres like positions. The fall off is to great on the earlier consoles and latest releases in my opinion. Maybe 3 or 4 picks per genre.
We will need to set a list ahead of time then rather than have 30 'genres' to pick from. Possible idea: Action-Adventure, Shooter, Platformer, Fighting, RPG, Sports, Strategy, and maybe a Miscellaneous? You can argue for MMORPG being is own category I guess.