What games are these? You can still count the amount of games that rely heavily on CPU on a single hand.
Its been shown OVER and OVER that BC2 gets 0 benefit from anything more than 2 cores. Black ops can run at 100% max settings on a dual core, BF3 remains to be seen.
Games are just as GPU bound today as they where 5 years ago. There are a couple notable exceptions to the rule but for the most part nothing has really changed.
I don't know where you are seeing over and over but BC2 definitely scales extremely well with quad cores and beyond. Here is one thread with charts to show. http://www.overclock.net/pc-games/659536-contagion-review-dual-core-vs-quad.html