Uh? The major reason for malfunctions is far and away component failure. Fujitsu, Sony, Toshiba and Gateway all had to recall batteries for the exact same issue (bulging/fire).
Sager is the *only* one of those that actually does individual unit testing. Alienware stopped in the early 2000's and if you actually look for Alienware quality control issues articles you'll find plenty.
Asus is no different.
They all use the same sourcing of components, except for Asus, who actually designs and manufactures the motherboards and the PLL control chip.
Sager doesn't manufacture any component, they also only offer a 1 year warranty, you have to pay shipping to send your unit back even under warranty, and
they fail just like everyone else's.
Looks like it's personal
I like some of their products, and I don't think they necessarily do business much different from other companies. I also loathe some of their products and decisions, which I have to put up with on a daily basis (ie: When I really want to do something I know you can do on their devices, but you can't do it because they won't "approve it" to sale on their store. Walled garden isn't just for users).
I also avoid their hardware tax like the plague whenever I can. When I needed a high end box, I simply put a hackintosh together. There's simply no added value on their high end products to make it enticing for me.
I would never look at their offerings for a server.
On the other hand, when I needed a small box for low end stuff at home about 3 years ago, a MacMini at $600 was a good buy. I very likely wouldn't buy one of their current MacMinis at that price today. But back then it was a decent deal. I upgraded the out of that box, and frankly never had issues with it.