I don't think the GB staff played enough of the best games of the generation. The best games tend to also be time sinks and Giant Bomb doesn't have the resources to cover them. The three games that I see the giant bomb audience put forward as great games from this generation that people should play are Dark Souls, Valkyria Chronicles and Neir. I don't think anyone on staff has played enough of those games to argue for them in committee. They'll all argue for shorter games like Uncharted 2 or Saints Row. While those games are great, they aren't the greatest of the generation.
Maybe then instead have them do individual "my favourite games of the past generation", and maybe let them break that down into console-specific lists.
It doesn't have to be THE definitive list. Just their personal favourites.