Honestly I've been seeing more ads for groups simply looking for anyone period, rather than a particular class. I cannot comment on a Burglars own contribution to a fellowship since I don't have extensive experience as one nor have I seen many lately, but I wouldn't worry about groupability. I don't think many groups will seriously turn you away.
"I am gloating so, so very much right now. Everyone called me a fool to do every deed! People pointed and laughed! And now, I have a horse with a smock! HAHAHAHAHA" - Anamatronix