I don't particularly like the UI, but I haven't had any Issue with teams ever tbh. It even worked on Firefox with uBlock, NoScript (ofc allowing like one or two domains for it) and VPN. For me, Office in general just works most of the time. I would never use it for private stuff, let alone pay hundreds for it, but for work it's more than fine.
Except Outlook. Holy fuck, how is such a central application such a pile of steaming garbage? It has the worst UI/UX I have ever seen in any mail client by far.