Holy cripes!
When the people discover a p2p game they go batshit. :D
Seems like most of the early reviews are insiders. One of them even said "We have been working on this for many a month!" I lol'd at the [review request club] signature at the end of another review.
I won't bitch that you have to pay to play, but I will say that at least you could have allowed me to keep playing against the same people I have already beaten.
Since I have beaten the demo any time I come back to it I get the download screen in which I can't click to go back to the main menu. I could clear cookies or some shit like that, but then I lose other info and this game isn't a top priority.
So yeah, demo or not, you should at least be able to replay without it being a hassle.