The up-armor HMMWV is still better and less lethal to its occupants than the vehicle whose role it's taken over - the ACAV or M113.
I've seen up close what happens to troops when an IED goes off under their vehicle. Haji adapts to our countermeasures and uses pressure activated IEDs because other kinds of IEDs are not getting the results that he wants. The South African vehicle reflects their experiences in Namibia and would save the lives of our GIs-they have built a better mousetrap. Don't even get me started about what a POS the M997 (Hummer ambulance) is and how it is virtually impossible to up armor.