To be honest its not just about Xbox dude... 50HZ is a blurry fucking mess I've hated for decades. I'd like 60HZ (or more obviously) period. Makes watching sports and movies on Sky/Virgin shit even on a nice plasma.
Whole system is ancient.
i'm laughing here because 50hz doesn't make things blurry, it has to do with the refresh rate, or in layman terms, the fps output.
NTSC system is known for having lesser resolution, which does make the picture blurrier in the global scope.
Also PAL has progressive system (i think UK has a system of their own. They just wanna be the odd one), which means that compared to the interlaced system, there's actually more frames per second rendered as a whole, while the NTSC system is interlaced, sending an interlaced signal of 1 frame difference, which creates the combing effect in broadcasts that have a big frame difference.
Having said that, adding 10 frames to match the 60hz means sending 20% more data per second. It's a big cost that an already established system can't take care of.