Lots of mattresses are rated +4.5 with 550 reviews but when you go read the revi...

Lots of mattresses are rated +4.5 with 550 reviews but when you go read the reviews, there's a ton of 1/5 reviews saying "the memory foam lost its memory after a couple of months."

For example: http://www.overstock.com/Home-Garden/Comfort-Dreams-Select-A...

Something really shady is going on with their rating averaging.