Hi :D
Even looking at the demo, the 'Rate this review' function doesn't seem to work properly as a user can choose both thumbs up and thumbs down at the same time - but can't remove either choice afterwards, etc.
I feel it would be nice to be able to turn this functionality off in the General Settings too, even if/when functioning correctly.
Maybe I have missed something very obvious about its functionality though, and it is working fine - I am wondering :P
YOu can disable the thumbs up & down by CSS ie display: none
that I have done and working well.
Cheers!