Flew Delta back from Atlanta last year and (sorry) I thought they were terrible.
The aircraft looked like something out of a 1970s disaster movie, it was so old, i half expected to see nuns with guitars appear and Leslie Nielsen to pop out of the flight deck.
No seat back TVs, and the main tvs at the front of each section were knackered to the point of being unwatchable. The movie was awful (Daredevil!) and was only visible through the red, green and blue stripes flashing across the screen. You have to pay extra for all alcoholic drinks, and the crew are even more ancient than the aircraft (though perfectly nice).
The only entertaining thing was their in-flight shopping catalogue, which was hilarious, and full of QVC-style things nobody would ever need, but someone has taken the trouble to invent.
In short, the flights were dreadful, but if you ever need a translucent polythene cat carrier on wheels (with tartan trim) or a revolving electronic tie selector, you know where to go.