Most of the hardcore gamers will say that it's bad cause well it's not up to date, then again they consider anything over 6 months a dinosaur.
The 7900GT is still one of the best DX9 cards, just keep in mind that we're technically in the DX10 era and there's already movement towards DX11, so support for DX9 and it's cards might fade soon.
Doesn't mean you need an urgent upgrade, but something to keep in mind in the future
Besides WAR will run no probs with that since it's not coded for DX10.