Meh. Every manufacturer is going to have a bad board from time to time. They are very complex devices. Current manufacturing standards allow for a 5% defect rate before they consider it a problem (for them). So you have a 1 in 20 chance of getting a bad board from anyone.
I shop best bang for the buck. Who provides the most motherboard for the lowest price. I stick to the major players though: Asus, Gigabyte, Intel, MSI, Biostar, sometimes EVGA or even ASRock.