Differences aside, I'll say that some of the biggest complaints people seem to have about Delta, never bothered me...

I was always quickly and efficiently helped when I contacted DL (either the Platinum line or email). Always had good service (ok, maybe not always, but in general I'd classify them as very good) on air. Using miles isn't a breeze, but it's not impossible and I do it all the time... sure, my dad always rubs in my face how he can buy award trips to south america for 40k miles all the time, but still, in my opinion, delta makes up for it in other areas....

Now, I do miss flying Pan Am on the 747, and watching the FAs carve a roast beef for me... I also miss a lot things that we used to have, such as no bag fees, less hassle at airport security, less air traffic etc... but, the world is changing, and it ain't delta's fault!

Anyway, my 2 cents!