My boys usually like it, but sometimes they don't seem to be in the mood. Sunday morning we had tent time from about 4:00 to 6:15, and they weren't really ready to stop. Monday morning they only played about thirty minutes, then into the pouch they went and started crabbing -- my cue to put them away. And some don't seem to like it much at all. You may remember a post Kyro made a little while ago about her little guy Zoom:
http://www.sugarglider.com/glidergossip/topic.asp?TOPIC_ID=26407
I really wouldn't worry about it, he'll come out when he's ready.