Hi jajajajim,
I think that this is common with reviews of any type although I would be very cautious about using mattress reviews as a reliable source of information about the suitability or the durability of a mattress anyway (see post #13 here).
Most importantly though … congratulations on your new mattress
I hope you have the chance to let us know your comments and feedback when you receive it … and with any luck maybe you will also be one of the “exceptions” that shares your experience in a few years down the road as well.
Phoenix