While Crysis was considered a brutal test for the past generation of GPUs, the torture test for the current generation is Metro 2033. With the eye candy turned up to the max, Metro 2033 isn't quite playable on the 7850. It's significantly faster than the older 6870, but still not enough.
Dropping the quality settings from Very High to High and the anti-aliasing method from MSAA to AAA makes Metro 2033 playable. While you may note that the minimum framerate was a low 13.3fps, this is due to a weird artifact in the benchmark. There was one low spike at the beginning of the benchmark, but the rest was silky smooth.
DiRT 3 uses the EGO game engine, which was developed by Codemasters. Other than the DiRT series, it's also used by the popular F1 racing series games (also by Codemasters). It uses DirectX 11, and the same game engine will be used for the upcoming DiRT and F1 games due to be released late this year. The 7850 is just a smidgen faster than the 6870. There wasn't much of a performance increase with the newer 7850, but it still led the pack.