What did it innovate? Sure it had pretty graphics, so did Doom 3 when it came out but that doesn't mean that it was a great game. Doubtless that there will be games with better graphics that will have an even worse story and more bugs than Crysis in the future.
Compare Crysis to the early build videos that we were shown before, doesn't even look the same. Its just like Oblivion's bait and switch
the game was overhyped and was nothing more than ordinary. For its mediocre story, terrible ending, and horrific performance I would give it a D.