I can't speak for everybody, but for me personally; all feedback is usefull and appreciated. For one, it's somebody listening to your music...and actually taking the time to listen to it for the purpose giving their likes/dislikes on your song. This can only be beneficial, because it's always a learning experience. Plus, as a striving artist - it's always good motivation when people take the time to comment on your songs. Sure, it's nice to see that the thread is getting views and the song is getting played; but it actually helps and feels better when people take the time to say waht they felt about it.
Peace