We pick places to stay by a) where we're going and b) highest review in the area. So far, 5 months on the road, we haven't had a bad one.
I throw out the high and the low, figuring the high was probably posted by the owner and the low by the nearest competitor. But then you need to read the reviews to see what gripes people had. Don't go back too far because a 2 year old bad review means less then a good one from a month ago.
I have seen some misleading comments that just weren't true. One reviewer claimed that the park had good OTA TV reception, but I could only get one channel. Also, don't go strictly by the price posted in "latest price". It may reflect some discount plan like PA that you don't have or a weekly or monthly rate that you won't get for an overnight.
Also, a bad review doesn't always mean that you shouldn't try the place anyway. If the price of the CG was above normal, the reviewer is usually expecting more and the review will reflect that.