ORD has some Great facilities....the one next to to H3 is very nice....deep stalls so you bag fits, tall doors. Most are as clean as mine at home....they maintain them.
DTW....second to none for the most part
IND has some nice facilities
JAX is impressive.....high end....even those infinity sinks
DFW is slowly renovating Terminals, but Terminal D is great. There used to be an awesome bathroom between B5 and B6....huge....maybe 8 standard stalls, a dozen urinals, and 4 Taj-Ma-Stalls with plenty of room to work.......was closed for renovations last time through there.
LGA....lots of them but most are small....genuinely clean
PHL....the worst I've encountered...they are renovating, but don't seem to keep them clean.
EWR....cramped....crowded, but gets the job done
LAX...crowded but generally nice
SFO....pretty nice
SAN...limited number....they seem spaced too far apart
MCO.....decent but always crowded airside.
MIA.....crowded and not well maintained....usually dirty....people transiting seem unable to hit the toilet or urinal. Many seem un-air conditioned
JFK....varies greatly by location....from 3rd world hell-hole to palatial
MSP....haven't been in quite some time but they seemed dated last time
DCA....nice facilities...can't have angry Congressman unhappy with their commodes