Resident Evil 6, with its fun innovating gameplay, nice new and old characters mingling, non-PC story line and action oriented twist is a must play. Its great to experience Resident Evil on a new level. RE6 has a creative way to tell the story by having different points of view retelling the events. There are innovating co-op where people playing different campaigns meet to fight bigger enemies together.
There are many mini-games (mercenaries and agent hunt) and the new ones coming as DLC are addictive (and better than RE5 Mercanieris) and add a lot of replay value. Its a must play for all real RE fans.
Is the game perfect? No, since the Merchant of RE4 is not in this game and skill points replace weapons upgrades, even weapons buying. But that is only half a star in lacking ;-)