I agree that it’s not a very intrusive ad

This is not what I would consider an ad. I also remember seeing it only once

Depends which games. I play Metal Gear Solid V, and it works almost flawlessly, aside from minor audio issues when objects in the game world move very fast (using a balloon to forcibly yank a downed enemy out of the combat zone creates a quieter than expected noise)

Other than that, it works very well :)