I never flew the 75/76 - looks really nice and I hope to get there someday.

To answer the OP question, the trips on the -800 are, for the most part, really nice if you're in the top third. Lots o' long haul domestic and Latin America stuff. Great layovers. Like every other fleet at every airline, trips can be really bad if you're junior. My most unpleasant memory of an -800 trip was BOS-LAX - 7+10 flying time...felt like I'd been kicked really hard in the head by the time we got there. I never really knew how bad the airplane made me feel until I got off it - noisy and cramped - not a lot of creature comforts...flew the -200 and -800 for ten years in ignornant bliss, uncomfortably numb.

I'm in the minority here I know, but I love the MD88. Quiet and short legs. Something for everybody, I guess.