Because its a steep decline. Going from 3 million + to less than 1.5 million.
You act like it's a relative comparison between Halo 3 and Halo 5's console/software space.
Halo used to move 3.4m copies a day in NPD only.
~1.5m for the whole month is a disaster no matter what.
"whole month"
Can't believe this isn't on the XB1 bingo card!
How mature of you?