Teams are decent, wdym?

Inb4: I've used ventrilo,team speak, mumble, discord, Skype.

It looks like you only use a tiny fraction of Teams' functionality. I agree, there's little to complain about when using it for IM/voice/video calls. When you start using it for other things, especially the enterprise features, it is bad. It is a resource hog, handles navigation poorly, has poor default settings, finding installed apps can be tough, etc.