Out of curiosity, I just checked the Cruise Critic website. You can also access it by going into the Trip Advisor website and clicking on cruises. They seem to be partners of some kind.
The general description of GCT was very positive, talking about the history of the company and explaining why it's so popular and why there are so many of us who are repeat travelers.
The only European river ship that had reviews was the River Melody.
One reviewer (although giving 4 stars) was very negative about everything - the cabins (too small), the food (only fair), the drinks (watered), the service (poor), the coffee maker in the lounge (instant), the layout of the lounge (unmanageable for its purpose), etc. That trip was in June of 2005. They did have a difficult series of flights getting there, and I think they were prepared to find fault wherever they went.
The other reviewer gave it 5 stars and loved everything. That was in June of 2007.
For some reason, there were two reviews of the Norwegian Sun, a Norwegian Cruise Line ship. And that was because both reviewers stated they had made their reservations online through a travel company called Grand Circle Travel or GCT. Can such a thing be possible?