Well you cant really compare the gaming world in the 80s to todays gaming market. People now-a-days have loads of money for the budget and if they dont have something unique it wont do well, we know have much better technology and so many engines of different styles. Meanwhile back then you either had 16 colour or black & white. Get my point?
Lets see, Quake 4 and Doom 3 are terribly alike, just a few improvements, Painkiller was also clonish, and thos eare the only really new ones I can think of, but like I said before, think about the different time settings.
