Is ATI RADEON® Xpress1270 HyperMemory™ a good enough graphic card for Halo 2?

Answer 1

That card more than meets minimum system requirement of the game. But minimum is usually equated to SLOW and UNEXCITING.
Radeon Xpress 1270 is better than most integrated graphics because it has dedicated memory. Additional memory is shared from system RAM through HyperMemory technology. BUT I would say, still not good enough.