FRA Terminal 1 A is horrible! If you exit at Gate 30 or so upwords at least you don't have to wait at the baggage claim, because it takes about 30 min to walk there. Terminal 2 D is the same, long way from D 20 to the exit.
I like Airports like Jerez, small, neat, nice view from the bar to the very basic rwy...
But the best one is
USM