Some people are going to hate life no matter where they work. I know people at the majors that hate their jobs. I'm at Mesa now and am very happy. Almost all of the pilots I talk to are happy overall here as well. Like it was said above, Mesa's bad rep comes from people that don't work here or worked here a few years ago.

Personally my QOL is better here at Mesa than it was at XJT. Others may find better QOL at XJT. Really it's all about what works for you.