I run a core 2 duo on a motherboard 8 years old, with a gtx460 (it was originally with an 8800GT, which I pensioned off) and I will guarantee you my PC outperforms most PCs sold today, gaming-wise.
The Core2Duo was a good chip for its time, but current Intels outperform it by a wide margin. I'm pretty sure that even current AMDs beat it, despite their Bulldozer mis-design. Likewise, the GTX460 will be beaten by modern cards.
If you are talking about Intel PCs that use only integrated graphics, your claim might be true. But gamers usually understand that they need a discrete GPU