You can probably say the same about every card that wears the Radeon name. Nvidia has always had an amazing driver team -- ATi (and later AMD) generally threw more powerful hardware into the price class because of their somewhat uneven drivers.
I will say this -- Radeon drivers have gotten better over the past decade. 10 years ago, some games wouldn't even start and others had nasty graphical glitches when running ATi graphics cards. Those type of problems seem to be gone now -- uneven performance seems to be the only thing that still seems to haunt Radeons IMO.