Its cards are meant to be used with Catalyst to fully use them.
If catalyst doesn't work feel free to holler at them or buy an nvidia.
I knew that there were major issues with ATI/AMD drivers some years ago, but from what I experienced and have read in forums the driver quality seemed to be much better in the near past. Now I begin really to regret that I a) recently have replaced my outdated Nvidia with an AMD card and b) that I recommended to buy AMD to other Linux users.
For me and my machines it seems that the drivers (both radeon and Catalyst) are down a step (or two) in comparison to Intel and Nvidia.