Well...I REALLY hate the blurry look of every xbox game (I´m sure games like Wreckless uses flicker filter at level 5 and soften at the same time), It seems sometime in Xbox hardware development somebody had the "wonderful" idea of making flicker filtering turned on by default, which blurs everything and makes some games to look sharper on the ps2 (even tought xbox games are rendered at greater resolutions), specially if you use RGB cables on both consoles.
Some people complains a lot about flickering, but for me and (I guess) many other people is not a problem, and I prefer sharper and flickering image to blurry and not flickering image.
I´m sure making a patcher for disabling the flickering filter on a certain xbe is not so hard to do, after all, every xbox game uses the same function to set flickering filter and soften filter included in the sdk.
Maybe the only problem would be changing that value in games that doesnt set the flicker filter to an specific value, as if you compile something with xbox´s sdk and no reference to the set flicker filter function the result xbe will have the flicker filter turned on.
We´ll I hope not to be kicked for this post