ATL is practically a second home for me. I am surprised they don't charge me rent. I have to connect a few times every week either through ATL, DTW or MSP. MSP is the least of my favorites just because you need a sherpa to get from A to F. Also, I can only get CRJ 200 service to MSP(another thread
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ATL is shockingly efficient for its size and volume. I have gone from E to T in about 10 minutes. Some of the Skyclubs are better than others but none are really that bad. E and F are my favorites.
I rarely eat at any of the restaurants so cant comment on those. I may be in the minority but I kind of like the boarding process in B. It seems to work. Yes, its Southwest-ish but it appears to be efficient.
The best thing ATL has going for it? its not ORD!!!
side note: favorite hub/focus city in the Delta system is DTW as long as the train is working.