Considering it was either undertracked or digital was around 31-33% as of the end of January I don't think sales are that bad. If digital is at 32% still and physically is at 4.5 million as u say than it's at 6.6 million total. Ya that's not great but it should reach about 8 million lifetime. Not the best sales imaginable. Down from previous games but it launched early in the gen. So did halo 3 you might say. True but when halo 3 launched there was little competition on 360. Now when halo 5 launched there where around the same amount of consoles but the shooter genre over saturated. Of course the game could probably be doing better if the campaign wasn't crap.
Halo MCC will sell 5+ million copies(including digital)
halo 5 will sell 10 million copies(including digital)
x1 will pass ps4 in USA, and UK.
