I would guess that "very new" is making a difference - the ones I'm going to are older but have been remodeled/refurbished/whatever into the new 'style.' But I'm glad there are still good Hamptons out there - there's hope!
I think I do need to check out Starwood/Marriott though - I tend to go to the same cities every year, and if the existing Hamptons/HGIs there aren't keeping up, I'm going to need some more options. It would be great if I could maintain status at both, although that might take some maneuvering for me!