Pretty much every airline, major or regional, is going to have their select few instructors/check airman who are arrogant, self-righteous a-holes. I've come across a select few in my 8 years in the industry, but far and away I have been very impressed with all the pilots I have interacted with in the training environment. As was echoed earlier no regional today is developing a training program to crush new hires coming through. In fact, quite the opposite is true as most programs are tailored to a 500-1000 hour CFI with no jet experience. That said, at some point no training program can make up for a lack of drive, hard work, ATTITUDE, and pilot skills, and they have to cut someone loose.