It plays video, and runs apps, and syncs with iTunes, but so does my iPhone and so does my macbook. It's too big to fit in your pocket, so you need a bag for it, but why not just put my macbook in the bag?
I'm a power user and I demand a lot from my computers. That's why I jailbroke my iPhone; it just doesn't do enough out of the box. The iPad, like the iPhone, is a closed, sandboxed platform.