Same here, I have a Linux Mint desktop set up for my kids and overall I'm happy with the performance. It hasn't been 100% smooth though. In particular updating from Mint 17 to Mint 18 took some effort to get things working properly. Maybe proprietary Nvidia drivers were to blame, but it didn't Just Work until I sat down with it and sorted things out.
Not that I'm saying that Debian is a better choice than Ubuntu here – Debian stable is Debian stable, and Ubuntu often contains stuff still considered experimental on Debian side – but unlike with, say, Fedora, many non-free drivers are included in the official repositories.