Video cards are one of the major, most expensive parts of a modern PC. Buying an ATI or any video card just because one thinks "it is cool" is easiest way to lead yourself to a disappointing build.
As mentioned by others, NVidia is still around because their product "just works". The only product that "just works" better is Intel (and they have more cards out there!) but they don't play in the same "bleeding edge" space.