Macbeth,
Unless you like abusive DRM, you should probably get it on X-Box.
You only need to activate the game online once, after that you're not bothered anymore at all.
Fallout: New Vegas and other games that come with Steam are much more a nuisance.
This game is incredible. Possibly my favorite game of 2011 to date. The worlds are rich and detailed, the platforming is fun and interesting, the combat is satisfying, the graphics and artistic direction are breathtaking, etc.
What's also amazing is that the game is in fact an 'indie' game, since it was mostly developed in China. Spicy Horse is based in Shanghai.
In many ways, this game is a middle-finger to the so-called "AAA" games of today, with their multi-million budgets, but shallow and short gameplay.