It's the internet, so anyone who doesn't care for something (whether having actually seen/experienced it or not) MUST repeatedly stress how horrible it is until everyone else is shamed into disliking it as well. I actually thought Frozen 2 was a lousy movie, but others apparently disagree. I'm glad they enjoyed it
I wouldn't worry at all about what other people, myself included, think of Riviera. If you like it, go for it. I actually find the monorail to be surprisingly slow and inefficient with large crowds. Have you ever waited 15 minutes on that mob-scene platform at Grand Floridian? It's insanity. The skyliner (mostly) continually moves and has a MUCH higher passenger rate than the monorail.
There are pros and cons with anything - resort, form of transportation, etc. Everyone weighs them out and reaches their own conclusion. Heck, there's a certain amount of insanity right out the gate spending as much as some of us have on a timeshare!

Fact is, Riviera will likely sell out in a similar timeframe as all the other on-property
DVC resorts have. Then we'll move on to Reflections, someone will start a thread on why it sucks, it'll sell out, and the cycle will continue.