ASUS is one of the better OEMs. They all have their failure rates, but I cannot say that ASUS is better or worse than the other major mobo OEMs. I have used ASUS, ABIT, MSI, Biostar and ASRock and am currently using an ASRock mobo.
The problem with the complaints is that you only hear about the failures and seldom hear about the good or average experiences. I don't think that you can point to any great problem with the ASUS brand,