My wife and I are veteran cruisers. We have done some of the worst (1 Carnival) and some of the better (Seabourn, Silver Seas, Crystal) cruises. We have done two SeaDream cruises now, both during the Christmas/New Years week to St Barts, for the last two years.
There are a few things that are striking. First, the ships are well past it. They need to go into dry dock and need to go through an extensive refit. The toilet in our cabin did not work throughout the cruise. We had repairmen working on our toilet facilities every day for the entire cruise. The floor of the bathroom was covered with water due to a leaky toilet and we could not get the toilet to flush pretty much every day. I have never had this happen on any cruise.
Second, every night - every night - I could not get anyone to wait on us to get a drink in the bar. I thought maybe it just SeaDream II but not, I had the same experience on both ships. Again, I can't work it out. I accept that there are passengers from hell, which I work not to be.
Third, and this is common, but the internet is nearly nonexistent. If you are going to be charged for the internet, can't you expect to get something? It was just about not there.
Overall I will have to pass on another SeaDream cruise.
As noted the toilet simply did not function adequately in our cabin. If you can't get the toilet to work there is not much more to say, really.