I must say 2,300rmb a night is extremely expensive for Guangzhou. I know it's a park hyatt, but I stay at the Park Hyatt Beijing and Shanghai all the time and don't pay anything close to that.
I suppose prices will correct soon. Reminds me of when the grand hyatt in KUL first opened; prices were basically the same as the Singapore property converted into ringgit. Prices are down a good 30-40% since then.