I agree that PC isn't seventh generation at all. A PC is as powerful or crap as you want it to be and are willing to pay for.
I don't really think there can be a best, especially comparing the three. The Wii is the most different obviously, the Xbox360 and PS3 are much more comparable. So I think the Wii is what I'd suggest most for someone to buy, even if it has a ton of crap it also has a bunch of really great games that I've had lots of fun with.
Then 360 or PS3 both have pros and cons. Different exclusives to each, one had free online, other is supposedly better due to the subscription model. I've got an Xbox360 personally but I'd be basically just as happy with a PS3 instead.