there is a very obvious and often overlooked issue with these lists.
the problem is that it's giving all voters a list of very specific games to pick from. However, to pick the correct choice objectively, the player would have had to play all of the games. however, that's NEVER the case. So what's going to happen is the most popular game/most purchased/most played game will always win in any category, not the one that may be overlooked due to AAA titles with bigger budgets and marketing. FPS will always outrank other genres, which further skews results.
Games should be ranked by an individual's play style, game library, and data taken from sites like steam stats, etc.