I've heard that they've gotten a lot better, but I don't tend to take that risk despite what others say, maybe some day. Personally, I've had great luck with Gigabyte, MSI, and Asus for motherboards and MSI has been exceptionally good with my GPUs. That is just what I've experienced with the machines I've built. The last two Asrock motherboards I got sported overclocking, agp voltage, dram voltage, but not CPU voltage. I was livid, I gave them two chances with the same result. Granted that was back with the Athlon XP and Pentium 4 where all the rage (skt478 and early skt775.)
MSI has also been the only company to actually work with me to fix motherboard issues, ...