Yeah, thats not too bad a system. Its unreal how quick you can fall behind in spec.
It's mostly just peen these days though right? It's not like a decade ago where you had to completely overhaul every 2 years or you couldn't run the latest games any more.
Someone with a top of the line box from 5 years ago (GF 8800) could still run Fallout New Vegas and The Witcher without too much issue.
It's a product of the longer console life-cycle. The Xbox 360 has already now been around longer than the original Xbox's retail life, and there's very few games that are made without the consoles as the lowest common denominator. So the only games that are actually taxing on modern PCs at their max quality config always able to have some settings dialled back to a point where they'll run just fine on an older box.