I really don't think the five star system on Newgrounds is horrible as Youtube's. The huge difference between NG's and Youtube's is that voters are able to remove content they don't like and that makes all the difference.
I, if rarely vote, on Youtube movies because there is no point; where as, here on NG, where I can improve my voting power and affect voting score, I vote often because I can drive the score up or down as I see fit. You can see that most of the movies in the Top 50 on NG are deserving to be there, where as the Top Rated videos are just over hyped garbage.
I think the problem with YouTube voting scale is that voter's are more apathetic to rating where on NG is they are a little more careful (even if it's just 0 or 5).