Although I passed 50 nights, this is probably my shortest list of hotels ever in this "new" chain...

Great:
St Regis Florence - Wonderful
US Grant San Diego - Very nice city hotel
W Barcelona - Perennial family favorite. Great urban beach hotel.
Sheraton Kampala - Top 3 Sheraton worldwide

Very Good:
SLS Beverly Hills - Luxury, but less than 100% pleasant
Four Point Nairobi Airport - One of the best airport hotels in the chain
Sheraton Tunis - Much better than average Sheraton
AC Irvine - Super nice and new with many modern touches

Good:
Westin Long Beach - Great location, but could use a total renovation
Sheraton Pasadena - Just had a renovation to bring it up to good
Sheraton Atlanta - Lively location, decent enough hotel

OK:
Westin Atlanta Airport - Rather unpleasant choice
Westin LAX - Good in many ways, bad in some others
Sheraton Cerritos - Average
Sheraton Chapel Hill - Average

Not so good:
Fairfield Inn & Suites Anaheim North/Buena Park - Bad location, bad clients, and more bad.