yeah, steam games. A lot of games work fine, but having to use the trackpad or to move around sucks.
In games like Keplerth I get it, it's not officially supported, but in games that have full compatibility it sucks.
(well, thanks to the highly flexible controller setup, it's possible to work around it, but it gets a bit confusing when the game tells you to press E and you press the A button in the gamepad for example. First world problems.