Honestly, this should not have much of an expectation to sell:
MoH:H2 on PSP:
Launch sales
1) 6,099
2) 4,763
3) 3,368
Total listed on this site: 0.01 mil
MoH:H2 on Wii:
Launch sales
1) 33,192
2) 29,342
3) 16,552
Total: 79,086 after 3 weeks
MoH:Airborne on 360 (not a psp side franchise version)
Launch sales
1) 82,045
2) 35,361
3) 16,250
Total: 184,643 after 13 weeks
MoH:Airborne on PS3
Launch sales
1) 20,337
2) 10,433
Total: 30,770 after 2 weeks
The series just doesn't sell all that sell. Combined with the fact that its not the main console franchise, they should be happy with the sales they got.