The usefulness of a comment affects it's colour, right? I think the colours are mixed up. "0 out of 1 people found this comment useful." showed up in green (as well as one in gray). "2 out of 3 people found this comment useful." showed up in red. Shouldn't they be inversed? Or maybe it's set that way on purpose?
No. The colours show the attitude of a comment towards the game. This will be more obvious once filtering by attitude is implemented.