fC2, spore, red alert 3, War, never actually got into the hype of AOC nor thought it would work and didn't buy it but the beta was a huge let down, thought it was terrible.
COD5 was a let down, but I guess it was still quite good, its just like playing COD2 through again though(or cod 1, or UO i forget which is which) it was just dull because not only was it WW2 again it was almost an identical story to the previous game and basically all the same levels, felt completely unoriginal.
GTA4 performance sucked, gave me dodgey eye pain going over bridges at night on the xbox blurry + low framerate and flickering lights = big no no. Terrible soft shadows all over, stupid story that makes little sense has no reason and not a singly likeable character. Working for scum who don't help you for no reason except to make money you don't need when you constantly talk about wanting to be good and not kill anymore, tripe, poor ending. some fantastic missions but most are fairly generic and dull, "dating" and hanging out with friends to elongate a game with boring crap side stuff, persuading people killing hundreds of pigeon's is somehow worth it.
With a good story, and some basic engine choices for performance and to look better it could have been a classic game, it was so close yet so far