Fizzy makes a very good point. It's pretty much effortless to welcome new arrivals, or to ask questions which might pertain to all writers, or to post a grammar question, or inquire about some aspect of the genre in which you write, or to seek information on how the publishing business works. These things rack up post counts and get you kernels of good will here at AW.
That said, I say do critiques at Share Your Work for any genre in which you read, even if it's not what you write. Every writer, from the well-seasoned to the teen who's just starting, can not only do a service for another writer, but can learn something (sometimes a lot) from critique on someone else's work.
Plus, those who critique get critiques, and better ones, than a new arrival who's paid no dues yet but hopes for extensive feedback on a story, chapter, or poem. There's truth in that one-hand-washes-the-other thing.
Maryn, whose hands are clean if you don't look closely
Rep points for people who post! (in case your rep point obsessive too 
