JFK is just generally terrible, although immigration is decent. CDG is bad because of the très petites toilettes, but at least it looks cool from the outside. MIA has a weird little concourse that isn't air-conditioned (and was a bit warm in February). VIE has a weird dichotomy of a sparkling modern side that is for flights to/from the West, and a communist-era side for flights to/from the East. I would imagine it was run concurrently during the post-WW2 partition of Austria.