I like the idea of it, but I don't think I'm popular enough to be rated positively or negatively, and I'm not going to lie: my self-esteem gets affected by shit like that. You have no idea how happy I am when people respond to my posts, or laugh at my jokes. It's almost enough for me to generate some stupid-ass persona like others on the forum have, just for the validation. But I don't want to be a jackass. I just want to be noticed.
Wow, this turned into a manbaww. About the internet, too. Is there any worse? Perhaps it's pathetic, but it's my $.02
Also, I suspect what'll happen anyways is that there will be a lot more negatively rated people than positively. Even putting grudges and shticks aside, people are much less likely to recognize a good post than a bad one.
So while I like the idea, I doubt very much in it's execution.