Well, if Natal does launch for $50 it would be about the price of a controller, which seems like a price more people would be willing to pay for... a controller. That's what it is, if it was something ridiculous like $150, like a decent fightstick, then it might end up selling like one (one that's heavily marketed). He may actually be right on that one but I'd put it a little higher.
As for the bestselling game. It's NSMBW, no contest. Halo Reach won't sell 8-9 million this year. It could do that life time, but it certainly won't outdo Halo 3, with it's $200 million ad campaign and more years on the market.
"Now, a fun game should always be easy to understand - you should be able to take one look at it and know what you have to do straight away. It should be so well constructed that you can tell at a glance what your goal is and, even if you don’t succeed, you’ll blame yourself rather than the game. Moreover, the people standing around watching the game have also got to be able to enjoy it." - Shiggy
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