That really depends. There are poets on the site, but as somebody who writes poetry, I have personally found that it isn't very helpful. If you can network and get together a group of poets, it's cool. Unfortunately, the process of finding those who appreciate poetry is tedious.
I have received good critiques on poems, but I've also received many that begin with the caveat, "I hated poetry in high school, but I think you're cool so..." As somebody who is trying to improve my craft, it isn't very heartening to have my hard-earned critique spots taken up by people who view poetry as some sort of onanine endeavor to which they've been subjected to witness.