Yeah, I avoid flying _through_ Detroit, but I've found that when I need to go _to_ Detroit, it's hard to avoid. <g> Fortunately, I've never had to go TO Detroit. I realize that every airline has horror stories, but I've had the worst luck with Northwest. Detroit's airport is much nicer than it used to be, but that's about the only nice thing I'll say about it.
I've had the fewest problems with Delta - but then again, I know people who HATE Delta.