i dont even consider anything asus makes to be very high quality. ive just had too many problems with their stuff.
Here's a contradictory anecdote.

One thing that I saw in my earlier link was Asus monitors that have a *lot* of really good reviews. Plus, they're in my price range. When did Asus get into monitors? And is their apparent good reputation for them accurate?
Asus started selling monitors under their brand, about 2-3 years ago (at least thats when I noticed). I am a huge fan of Asus main boards. I don't think they actually make the panels themselves though. Asus has been making laptops for much longer, and have earned a fantastic reputation in that as well.
As for the monitors, from what I have seen they have very good picture quality, the screens are evenly bright with a good contrast and great colour saturation (ie. they don't look washed out like the cheap Acers/E-machines do). They also have a wide viewing angle. Unfortunately, I have never owned any.
Personally, I have yet to see one returned to the store where I work at for any reason (which is more than I can say for E-machines).
To directly answer your last question, yes, I think there is every reason to believe that the apparent good reputation is actually very well deserved.
I've flipped through some of the Samsungs, and they're really nice looking, especially the Samsung Syncmaster P2570. I just can't afford the $250 price tag that a lot of them seem to be carrying...
My current monitors are Samsung SyncMaster 932bfs. I haven't had any issues with mine, and in general what I have seen and understand from my research is that Samsung along with Dell, HP, and Apple are the premium monitor manufacturers. Thats not to say the monitors are any better, they just have more features.