I preface this by saying that I don't have a club membership, so am only in the lounges sporadically.
DEN: Big, spacious, decent food. Something about this airport makes connecting here low-stress
SFO: I'm normally starting or ending here so I don't worry as much about the weather delays and making connections. Decent food.
LAX: Eh...but "eh" can be a good thing.
IAD: I know, but it's my home airport. Also, if you are here outside of the afternoon rush, the terminal is a ghost town.
IAH: I couldn't begin to describe the layout of this place, I've only been here a handful of times.
EWR: Delays delays delays delays delays...
ORD. Man I hate ORD. I just want some decent food and a place to sit down quickly to eat it.
I guess it's not really a hub anymore, but I love connecting at NRT. So. Freaking. Easy.