Penguin, for what it's worth, I completely sympathize with your response to the 'poo-poo' situation in HK. Firstly, we're talking about a well established brand/chain hotel in one of the largest and most cultured cities in the world; we're not talking about some Chinese hostel way out in the middle of nowhere. Secondly, sewage/fecal matter coming out of the plumbing, that's pretty terrible. It's not like you were complaining about the lack of Platinum arrival gift or something trivial like that.
We had but two unpleasant stays this year out of about 60 or 70 nights at a hotel; one of which was at the Liberty Hotel in Boston. Well, for the $400 or so dollars per night that we spent on the hotel for a week-end in the city, the bed was worse than that of a Four Points property. Mentioned it briefly at check-out and just thought, no problem, when we do this again we'll stay at the W or the Westin instead. So, when the post-stay survey came via e-mail I did comment on it. The manager responded with 10K SPG points and a nice e-mail inviting us back when the rooms were refurbished later in the year. The SPG site reviews of the hotel suggest that I wasn't alone with respect to this opinion. A very pleasant surprise and we'll definitely give them another shot.
I mention this because instead of blasting the Sheraton HK on Tripadvisor or Twitter or some other social media, you spoke directly to the hotel. Personally, I think it's totally ridiculous when people do the former, generally without raising the issue with the property/business that 'offended' them so 'egregiously'. I'd like to believe that the major hotel chains and their management are very responsive to feed-back on guest's experiences and candid responses are appreciated.