It was already claimed by Epic the 360's limits had already been reached with the original Gears of War. Of course that wasn't true as there are more efficient approaches to re-write the Unreal game engine (which are especially beneficial to the PS3).
The GPU is probably strained towards very near its limits with Gears 2, this due to tiling issues which has been perfected. The Xenon can't help the GPU that much, already launch titles tapped a vast majority of all 3 core resources, by now the game engines are more efficient in tapping the last bits of Xenon performance, much more can't be expected.
Yes, I think Gears 2 will be about as good as it going to get on the 360 for this sort of game, I expected much more from Halo 3 considering it was the most high profile first party exclusive with an enormous budget and many years of development time on a relatively easy to tap into configuration, I think Gears 2 will be much better but will easily be bettered by PS3 games.







