Agreed that US club lounges are well below international standards, with a few exceptions.
My all time favorite, is the Marriott Marquis (Times Sq.) NYC. I've booked into that hotel as opposed to the other Manhattan Marriotts just because of it. That lounge even has a check-in desk for Plats. (Golds, too??) It is very nice to give bags to bellmen, take the elevator to the lounge and have a glass of wine while sitting at a nice desk checking in. I don't even mind paying for the wine. Evening snacks could easily be rated a 2-star buffet.
On the opposite end, I was in the New Orleans Renaissance (Arts) last week and even for free it was overpriced. At 8:30 I arrived for breakfast (served til 9) and found cold coffee. Attendant said it was too late to make more. I carry Starbucks microground, so I asked for hot water and made some, but then found out they were out of milk.
My biggest complaint, tho, is that most US lounges close on the weekends (Fri night, Sat all day and Sun AM). As someone who usually flies home Sat mornings, this always ends a stay on a bad note.