The other vehicles it is being compared to are meant to go in harms way by their basic desgin. The Hummer is not. It is meant to take folks from point A to point B and not to go into active combat.
Well, it surely wasn't designed to have explosives detonated under it. Although, in a small arms fight against infantry it should fare ok with the mounted machinegun, still NOT an assualt type vehicle. look at the picture of the M1A1 in the picture above this post.
Baloney, the scout platoon in the Mech Infantry battalion I was in several years ago used the Hummers for recon and screening. We've known since at least Somalia that the Hummer is insufficient for the tasks it is given in the real world. We shouldn't buy any vehicles without at least some armor plating.