Valve launches SteamOS

Since the APU IS the GPU, that is of very little comfort.
Also, the Radeon open driver is nowhere near the performance of the fglrx on a dGPU like the 7750 ( dunno about the APU, doesn't work ).

TF2 works fine with most special effects disabled, but, then again, I would have bought an Intel with HD4xxx for that.

AMD markets their APU as best value CPU+GPU, basically stomping over Intel's iGPU. This may be the reality in Windows, but in Linux, only old or simple engines, 2D titles and the like work OK-ish.