I posted about this promotion via Alibaba a year ago or so on FT. I didn't notice out of control exec lounges or lack of Suite upgrades in China since I posted. Lounges here are usually top of the line.
US ones disgust me for the most part. I'm glad I no longer have to stay in Marriott's in the US just to maintain status. I haven't had particularly bad but nothing particularly good in terms of experiences. And they always seem crowded because of people who acquires status from cc