@cdevroe I've been using the public beta since the 1st version and I think the negativity is over-hyped, at least based on my experience. In terms of bugs/instability I think it's gotten dramatically better. The beta from two weeks ago was very stable for me with the only crash being related to the Spring app for twitter when trying to reply. Same for the RC. No problems except for that specific app when trying to reply to a tweet.
In terms of the design of the app and complaints, I think that's a different story. In general I'm very happy with the design/intended function. My biggest critique would be the lack of complete control of window sizing and placement. Seems to be the most repeated complaint from others too. There are other behaviors that could be improved too. That said, it's been totally functional, usable (for me) over the past 3-4 weeks.
Maybe I've been extremely lucky but I think there are a few loud voices on Twitter/podcasts that are just basking in the attention they get by painting it as a dumpster fire.
All that said, it's off by default and so everyone can just contiune using the split view/slide over multitasking they have been using with no problem. I was very happy with that version of windowing but have found that, to my surprise, I think I prefer Stage Manager.