Not too many years ago, when I was thinking about leaving one organization for another, my boss told me, "Randy, the grass isn't greener over there, it's just mowed differently." He was right. In this case, I don't think DL is "the bad guy." But, I don't like the way they decided to mow my NW grass.
I think many NW people (as well as many DL people) have offered constructive and reasonable input into making DL a better airline (in the many pages related to the 2010 program). Sadly, I'm not seeing much evidence that anyone is actually listening.