This is crucial. This is why I always show all my WIPs to my fiance, who knows absolutely nothing about music production or composition whatsoever. She'll say things, what she likes, what she doesn't, and even though she may not exactly know what's actually going on, I can still use it to make my track better.
Even critique from less experienced musicians can be taken into account when making your tracks better. For example, a rather noobish producer recently did a lengthy critique on one of my tracks, "A World in Motion", and although he was incorrect about a few things, I was still able to use what he said to make my music better; such as when he said that one of my rhythm guitars was playing a "wrong note" at a certain time, I was able to evaluate what I was doing (each guitar was actually playing something different at that time, they weren't actually supposed to be playing the same thing) and pinpoint exactly why he would think what he was thinking (my execution on that specific production technique wasn't as good as I thought I was).
Another critical piece of advice, though; know when "criticism", and I hesitate to call it that when referring to certain statements, is utterly useless. You'll know it when you see it.