I've been playing System Shock 2, the original version i got from GOG (it took a bit to make the controls work but it works fine, though i found a weird bug with non-Steam games in that if you rename the game it loses the control settings - e.g. i set up the controls when the icon was named "SS2.exe" but when i renamed it to "System Shock 2" later it lost the settings until i renamed it back to "SS2.exe" :-P).

I also played a bit of Stranger of Sword City, a turn-based and grid-based blobber. I find the deck works fine with such games.

Also both games play just fine at ~5Watt settings (i like to optimize the settings per-game to get more battery life out of the system).