Even with 2 million, that's since November 19th. That's a million a month. That's pretty damn good for anyone.
Now, as long as they use "units sold" and not "units shipped"...
Whut. It's been a month and nine days, not two months since it launched. Try your hand at math again - it would be more accurate (though still off by a bit) to say 2 million in five and a half weeks. That's a hell of a lot more impressive than a million a month.
Oops. You're right. Only a month, not two. The hours of sunlight this far north.. it gets a little hard to keep track of time. Daylight only lasts maybe... eight hours? But yeah, month, not months.
S'alright, Kotaku made the same mistake, too.