MyWOT is seriously messing with businesses from anywhere with any reputation. 90% of the ratings seem to be made by a group of users. Their comments look like a template and mostly negative. They claim that rates are made based on a huge number of votes but that's pure lie. Powered users rating weigh is way higher than a normal user. So let's make some users there and rate until we are powered user and Voilaaa, we can screw anyone's reputations. Oh yeah, if they pay us, we remove our bad ratings. Good business isn't it ?
I guess geeks can make loads of money on MyWOT (Web of SCAM).
Bottom line, you are right, mywot should not be trusted as it's filled with biased ratings.