I had the same problem last version of customer reviews, don't thin i fixed it then either.
When a review is made using apostrophes or quotes i get backslashes inserted before it.
I've googled merrily and tried all solutions i'm confident with,these include;
php.ini magic quotes off (php info reports magic quotes as off)
.htaccess magic quotes off (causes internal server error)
Adding another php.ini file in the customer reviews plugin folder
Nothing seems to fix the problem and it's a deal breaker, no fix - no use.