As a system builder myself, general hobby, not by profession, also not to sound like a fanboy, but just a little bit of history..
I have used Asus boards since their beginning (1989-90) I believe, all the way to as I recall a Pentium 4 P5N32 SLI Deluxe.. It was on or around that time where they have moved their factories to China..
Asus motherboards started showing up both Made in China and Made in Taiwan, it was a notable quality difference between the Taiwan vs China counterparts.. There was even a price premium for their Made in Taiwan boards also.. I assume this was probably done due to cost, but then as we all know in China (You should really read the book "Poorly made in China" by Paul Midler), I'm going to keep my comments to myself regarding Asus move on this as I don't want to start a fanboy flame war.
Long story short, I recall having 2 Asus boards that just did not perform the way it should have, one being a P3 board that turned out the board itself didn't supply enough power to the AGP port, had to bring the board in and I watched a tech solder something on the board. The second board was the P4 P5N32 SLI that just didn't want to enable SLI and when it did, the board got so hot, it crashes 4/5 times, back and forth with Asus, ranging from board replacement, them blaming my box didn't have sufficient air flow, call you back but never call, after 2 months, it was the "straw that broke the camels back" and try a different board manufacturer.
I have bounced around a few companies since then until I found myself buying a Gigabyte X38 UD7, it was then I realized that the board was Made in Taiwan, quality seemed OK..
Fast forward to today, I have built quite a few rigs and have used Gigabyte.. Their CS is good and they have always answered my questions, the only time I had to RMA a board (P67 UD7 B3) due to the PSU connector onboard going up in smoke literally, I contacted Gigabyte and they asked me to take make a copy of the email conversation and take it to their local distributor, not a problem since it was only an hour drive away. I dropped off the board on a Thursday and a new board was ready for me to pick on the following Tuesday..
Today, I have a server and my main rig, both are using Gigabyte motherboards, my next build (2011 SBe) will most likely be a Gigabyte board also.
on another note, has anyone noticed MSI is catching up? I hear good things about their boards, they are really trying hard to win the hearts of all enthusiast.