My friend T.L. Morganfield has written a series of awesome posts on Using Critiques:
Using Critique: Part 1: First Things First
Using Critiques: Part 2: I’ve got a pile of critiques, but what do I do with them?
Using Critiques: Part 3: Where to get critiques, and how to develop lasting professional relationships through them.
The final part is forthcoming.
Well worth a read. Go check them out!