Its also possible to get focused on making a comment and completely miss the part of the form where you rate the product.. in which case, I suppose it defaults to zero.

I know I did that once... and there's no way to change it once you submit. I'd be inclined to think that most, if not all, of the low scores are because of what Matt said or because of neglecting to rate it at all.

I have yet to meet the person who has been exposed to PGMusic products and walked away feeling any way other than totally blown away!