More powerful? No. But they are still better in some ways:
* No DRM. I have been burnt several times by PC games on this front.
* No viruses or malware to worry about
* Far fewer updates to install and in general less maintenance
* Warranty - if I build a PC myself and it breaks, I need to fix it (I recognise that for more technical users and/or people with more time, it's a plus that you can fix a PC yourself - but that isn't everyone)
* Compatibility. It's hardly rare to run into issues if you try to play a PC game on launch date, and often graphics card driver updates fix some games and break others.
* Noise and size (it's hard to make a small quiet and powerful PC on a budget)
* Peripherals - there is a standardized set that "just works" for a console. On the PC, maybe half of my Steam library supports my controller out of the box.
And one non-technical aspect which isn't a concern for everyone, but is for many:
* My friends are all on [XBox Live|PSN] and I want to play with them
My stance? I game on PC, PS3, PS2, Xbox 360, Wii, 3DS, iPad, and occasionally on an Android phone. They're all great in their own way. I wouldn't say any of them was better than all of the others on all axes I care about - but if pushed to have just one, I would pick the PC.