On good days, the time-share part was transparent. But there were dozens of access points; on rare days when most of them were in use, you could press a key and wait 10 or more seconds to get the character echoed back to the printer.
One day I got one hour of access to a plasma-screen PLATO, and it was amazing. Never again even saw another.
Matt sneak-installs ARCNet at the university, which I'm pretty sure never happened. There's also a fictional French professor "Dr. Caron" who talks about the (real) Minitel.
The Minitel actually was pretty decent, and they had a revenue model vastly different from what we've ended up with (the cost just ends up on your phone bill, and the service providers pay the phone company). I'm not saying this would be better, but at least no ads!
MECC on the other hand