The old animation doesn't look particularly good either though, I think a lot of us remember things to be better than they actually were at the time. This one can look very nice at times and other times it looks like a blend of the old style and the new more common style of animation blended together.True, but no one in their right mind can say the new characters looks better than the original... the style comes down to preferences, but the lack of detail doesn't, it looks worse than the original.
Same with TMNT, very few of the new series that matches the detail of the 89 original.
But yeah, when you get older you tend to dislike when familiar things you love gets changed, like your testicles start hanging more than when you where a teen.