In terms of sales, how is that? Is that a success?
Considering a third of those are ultra heavily discounted, not really; 2010 is approaching the 5 million mark as a comparison.
The sales are solid for a high production niche title, it's still the lowest selling non-mobile Alien game outside of A:CM, and with everything except AvP2 being available for resale, that's rather unlikely to change.
I'm not sure what metric you're using, but GTA has sold an assload more than that for any version; and V is on track to sell exactly a metric f**kton of copies when the PC/NGC+ version hits.