I'll go for a 7/10 on an average day. It would be higher but my Roomba died!
DH and I were sitting in the living room with it cleaning away when all the sudden I noticed it was "dancing". It was pretty cute and seemed to be doing a jitterbug. I even got up laughing and joined it!
Unfortunately it was apparently the dance of death for the poor thing- it had gotten a loose carpet thread from the berber carpet and, well, choked to death in front of us. Lesson- if your Roomba dances, turn it off and investigate, don't join it!