The Mac user couldn't fullscreen the game and had weird rendering artifacts.
One of the windows users had the game take 10x as long to load as it should have (commparing to mac/Linux/windows on vaguely similar hardware)
The other windows user kept dropping. Note that we were all sitting at the same kitchen table, with reasonably good wifi.
Linux worked flawlessly.
I'm sure there was some luck involved, but Linux gaming has truly come a long way from being the most finicky platform.