COD IV - GTAIV - Mass Effect - Resident Evil 4 (Wii) - Crysis - Civilization IV - Halflife 2 - Condemned 2 - Mass Effect - Stalker are all games that I have played recently that I would say are better than MGSIV.
If you're a huge fan of the series then its 100% the best game, if you're not then its just another game.
Tease.