Can't stand:
DTW (general horrible airport)
CLE (general horrible airport)
BWI (just a pain and security's a mess)
IAD (nothing to do)
PHL (nothing to do)
DEN (long walk to flights, although the security line isn't that bad as it's one line for all flights)
LAX (long walk to flights)
SFO (long walk to flights)
PHX (everyone's so nasty there)
LAS (do we need slot machines in the airport?)
I don't particularly like any of the New York airports as they always seem to come up with an overly complicated and expensive way to use public transportation to get anywhere you'd want to go.

Like:
HNL and OGG (not much to do in them but you're in Hawaii)
ORD (at least T1, it's one of the better designed terminals that was built any time recently)
DCA (not as good as it was before Sept. 11th, but still good)

SAN was an ok airport (haven't been in 4 years though), but the one airport I can't stand is HKG. It just takes forever to get to/from a flight in that place.