I dunno, we used Hangouts at Google and it was fine for meetings, though it did have some enhancements on top. It was possible to call in or out, though I never saw that feature used except "I wonder what happens if..."

Ultimately the problems with these meetings involve the social problems. Someone is absorbed in thought so they don't notice that a more quiet person in another room wants to talk. They point at the screen, not realizing that the other office can't see that. They point using their mouse cursor not realizing that it's too small to see on the screen. Or the more mundane; not having an agenda, inviting too many people, not inviting enough people, etc.

And, of course, "we're getting kicked out".