acl65, I've yet to find an airplane that didn't have its quirks, and I've flown almost everything in the current pre-merger DAL fleet and many that are no longer here (DC9, 727, 737-2, L1011, MD11)). As several have mentioned, the 738 doesn't hold speed that well in a VNAV descent; it sets the throttles to hold what it thinks it should, then they go into "arm" until the speed gets off desired by a pretty big amount (I don't remember exactly).

Having said that, the two biggest disappointments in my flying career to date (airplane wise) were when I switched onto the B767 and when I switched to the L1011. In both cases, I'd flown with so many guys who had nothing but great things to say about them but, alas, when I got there, I found those planes had just as many quirks as any other.

It's just a matter of getting used to a different set. I think you'll really like the 738, just don't ask it to be something its not.