Trust me, buy it. It is the definition of EPIC. Gameplay is fluid, puzzles are good, bosses are awesome and a whole lot of fun, weapon system still as good...and finally the story, one of the best out there and the ending really put a nice end to the trilogy.
It's at the MGS4 level of Epicness.
EDIT: Gonna beat the game on Titan mode later on after I finish Bioshock 2 and RE5 platinum. Don't wanna be done so soon with that gem.