Ace Combat: Worse, 6 was a let down and have heard nothing about another one.
Call of Duty: Better, and it would be much better until MW2 came out, but that one bad egg didnt ruin the others.
The Elder Scrolls: Better, Oblivion was just brilliant.
Grand Theft Auto: Worse GTAIV the worst out of the last 4 made (not including handheld versions)
Gran Turismo: Dont know yet but looks promising, GT5P was really good for what it offered
God of War: Again I dont know yet but the demo was awesome.
MechWarrior: Dont know yet I just hope the 360 version doesnt ruin my favorite PC series of all time.
Metal Gear Solid: Better, other than a few bad story choices, quite possibly the greatest game ever.