See what youīre saying, but isnīt there a lot more to it?
Do you mean to say, that an old 737-500 outperforms an MD82 with -219c engines trying to attain max height over a certain point after takeoff at max. weight for that type? Genuine question as I donīt know, but would be pretty surprised.
Although I am well aware that low speed performance isnīt where the MD has itīs gloriest moments.
I have to admit, that being just a driver, makes you think along other avenues when the word performance comes up.
1) Am I happy with the single engine performance in my aircraft for the routes that I fly, should one engine go south. Well, I fly around 70 different routes, and on 69 of them no sweat. Should it happen in Innsbruck Austria I would really sweat. But so would the 737/2/3/4/5 driver me thinks.
2)Getting stuck behind a 737 classic anywhere in the air is a waste of valuable beer time for a MD driver. Now, the new smart wing on the NG did wonders in cruisespeed and altitude, wish that McD had put a new wing on the MD90 that I also fly.
In short, with my narrowminded glasses on

I can haul 130-140 pax just as safely (for my routes) , just as comfortably (for those who pay most, in the front of the MD, I think that most will agree, that no short hauler comes anywhere near the silence of the MD) and a good deal quicker than the 737 classic.
W/ rgds. to noise, my opinion is utterly childish and irrelevant for todays aviation environment, as I belong to those who think that all jetengines should sound like a PW 217/219, and not a sorry excuse for a hair dryer
Rgds Timilu