I can't think of any other service from Google that's more weirdly polarizing, although Google's Pixel phones probably run a close second. People either find Stadia useful and say they use it regularly, or they hate it to the point they seemingly spend their days telling everyone how terrible Stadia is, how it was doomed from the start, how investing in the platform is a waste of time and money, etc. Oddly, you get the same thing on Pixel forums where people spend as much time telling everyone how they switched and how much better their new $whateverphone is than their previous $googlephone as people do looking for support or saying they like their phone just fine.

Perhaps when Google disappoints people they really disappoint them? It seems like an oddly visceral and out of proportion reaction to waste time on the internet disgruntled and complaining that some people like something you don't like.