Are Halo 3 ODST sales upto expections?

[epinefridis]

So
@Solid_Snake4RD
Is this a hobby of yours or what?
http://www.vgchartz.com/forum/thread.php?id=93774

Blah blah blah, the game is great, but MS fans said it would hit 20 million in 3 days. And it didn't. So, did it underperform? blah blah blah, discuss...
Discuss what?