I'm with you with the Lync-hate. I've had problems with getting simple chat to work - in the middle of a chat session that seems to go well, Lync suddenly informs me some message wasn't delivered. And this happens often enough to be annoying. The web-integration (if you ping someone who is logged into Outlook web, the ping shows up in a popup window) is bad - if someone pings you within a gap of a few minutes, the original pop-up isn't re-used. There is a new pop-up, with no history. After using gmail chat, this feels regressive. And yes, there is the copy paste issue you mention. The screen-sharing is not robust - we've had so many sessions crash that we've moved to WebEx.

That the simple chat use-cases don't work well is, frankly, confounding to me.