I struggle to find a reason why Netflix and Amazon aren't good enough already. Hulu, obviously, is shit because you pay for ads. But that notwithstanding.
But Microsoft has a long solid history with multimedia. There's the Zune, Media Player, Media Center and extenders, I'm pretty sure there's a bunch of other stuff I can't remember.
They are all crap. For most shows you have to wait months. Same for the movies. I subscribed for a month and i cancelled everything after a day. I can't understand the people who pay money for this. I just wanted an alternative to torrenting shows, but there isn't one. In Europe you must download them, at least you can watch them the day after.