I am sure that I will get shot down in flames over the rest of this post, but I will go ahead nonetheless.
SAMUI
It is many years since my wife and I have encountered such poor service, not confined to our hotel, but which seemed general in the Chaweng area.
I should also state that we aware of the reputation of Chaweng, certainly not expecting it to be as laid back as Hua Hin, and travelled there with our eyes open

To be brutally honest, we were not at all impressed with Samui (no we had never been there before!) and Chaweng in particular. Samui has some lovely beaches and views but, perhaps, it is now overcommercialised.
We also found that the whole island was overcrowded and, for the first time in Thailand, we felt that almost everyone was 'on the make' - if you come from Europe and like Ibiza or Grand Canaria - you will just love Koh Samui!
-------------------------------------------
"Koh Samui (and Chaweng in particular) was not to our taste at all. We were fortunate in the location of our hotel. Our research proved correct and we were on a very picturesque part of the beach, away from the noise of the main town (and the aircraft noise - only slightly further South!).
Even this was spoiled somewhat as they had closed one entrance to the hotel and were developing on the South side (not mentioned when booking). A consequence of this was that they were using the minor entrance for all traffic and this caused rubbish trucks, at 3am, to park behind our “deluxe villaâ€