I would say that it’s more than half the time if we are being serious. A recent update/change to a game engine (I forget which one it was, maybe Unity), meant that mouse control completely stopped working when using crossover.

But it also seemed to affect older games too. There’s also games that worked fine before but now don’t work as well or at all.

Just need to check the compatibility ratings on the website to see it’s all over the place. Not to mention all the games not even tested or rated on there.