It was slow, laggy and unstable for most of the time. Also, they didn't invest in the transportation codecs much.
After it's marred, they didn't try to mend it much, and when it started to work well due to better bandwidth, they didn't push it back again. It fell to the wayside of "value-adds" all Windows software vendors love to put in the bag.
> "Oh you get the whole Office, great. There's some Skype for you, too. You know it doesn't work well, but it won't hurt to have it installed, no?"
So they blew their chances, badly. I personally don't like Microsoft, but they could have made me use it, if it worked well. Now I use Meet, which is again bundled with Google One, but it's web based and works much better. It also supports the nice features (noise cancelling, advanced backgrounds and whatnot) under Firefox, too.