I wouldn't drive an H anything on pricipal alone. Aside from that, it wouldnt fit on a lot of the trails I go on. Also (not GM's fault, I blame MTV for this) Hummer has become a bling icon more than off road.
"MTV, who has done everything in their power to destroy music as we know it..." - Louis Black.
Might be a great vehicle, but I'll never know.
Ask someone why the HUM-V is good off-road, likely response is, "they must be good, the Army replaced the jeep with them." But the army is fighting a war not off-roading.