Cool thread...
Bests:
DFW : My most often used connection airport. I put it first 'cos it's improved so dramatically. With the TrAAin I hated the place. The skylink changes all that in a huge way. JFK could've taken lessons on how to do a peoplemover properly from DFW. I can more often than not get gate to gate in 12 minutes... and Terminal D is *very* nice with lots of options. I do miss the Terminal A Flagship Lounge tho... but that's an AA thing.
TPA : Once they got security sorted out and did away with the 45 minute lines to get into the terminals it made the airport much more bearable. Landside it's awesome, the two-sided design is a bit odd until you get used to it (blue/red) but it's very clean and spacious and lots of amenities compared to other places.
MIA: MIA polarizes people. You either love it or hate it. I love it for two very dumb reasons, La Carreta (the Cuban restaurant just outside term D (?) and the eye candy. MIA CONSTANTLY has some of the most beautiful women in the world transiting... the older parts of the airport suck but the new terminals will make up for that.
FRA : I like the airport so much I stay at the Sheraton when I go. Parking costs a fortune tho but it's sooo convenient. Great spotting, great access to the autobahn, the airport and the rail network. Walk out the hotel to the trainstation... then when it's time to fly home; get a late checkout, go check in early for the flight then go back to the room to hang out until it's time to go.
HKG: Best for last-the best airport in the world and the best airline lounge I've ever experienced (haven't flown EK nor done DXB though). The F side of the Wing is just amazing. I always starve myself just before i go and leave about 3 hours to have time to pillage the buffet (catered by the Peninsula I believe).
Worsts:
IAH: WTF is up with needing to go landside to get from one side of terminal A to the other?
I don't care if one side is Skyteam and the other ain't... some of us would like to connect from the CO side of the world to fly elsewhere (UA, etc). DFW is MUCH better in this respect. Not to mention every time I fly I end up having to walk from the very far end of Terminal B to the ass end of Terminal E (E.G. about as far as you can go).
JFK/LAX: I'm not sure which is worse. The Airtrain makes JFK more habitable but is still woefully unreliable and last time I was there the intra-airport train was running BACKWARDS (E.G. a 2 minute trip turned into 12). LAX is just... LAX.
GUM: Humid as all get out, nothing to do and everything shuts down promptly at nine before many flights go out.
PHL : Don't even get me started... nuke the entire effing facility and take the airline with it.
SJC : Not the entire airport, but Terminal C. Beyond a dump. NOTHING to do, one food place and just plain dirty and run-down.
PHX : Terminal 2 - wow. Much as with SJC there just ain't much there.
LAS : Only due to the landside mess. There's just GOTTA be a better way to do security.
DEN : See above. The place is beyond a clusterF.
JNB domestic side : There's worse in Africa but one expects better from the 'gateway to Africa'. Int'l side is actually one of my favorites because the shopping, spotting and people are all so unique.
NRT : Lines to get in, lines to get out... but the new OneWorld facilities are quite nice. CX lounge MUCH MUCH improved and the beer machine ROCKS.