The quality is bad, even when i put it at 720, but i can relate that your (correct me if I'm wrong) computer isn't good. But I will give you that you have hit puberty, I will give you that.
Try 720 and fullscreen.
The quality on my end is great, like I'm playing the game, also, I don't have a 'bad' computer.
EDIT: I don't play fullscreen. So if you DO go fullscreen, there probably will be 'crappy' quality there.