No I get that and like I said I think its really impressive! But, I think that the controls detract from properly delivering the message (and it would be much more enjoyable to use if movement was less fiddly).
I completely agree. I'm a game developer, and I'd have a hard time intentionally designing a worse mouse look. Ouch. (I realize that they're not using mouse capture intentionally).
That said, it's a fantastic demonstration of what's possible in the browser. I'm really looking forward to seeing what three.js is like in a year or two, and how that rivals Flash.