Yeah, most of the civi Hummers are pretty lame, at least 1000 - 1500 lbs heavier and lack locking diffs (some might have Detroits, ARBs or Torsens, but not many). The military ones are definitely a lot more purpose built.
That being said, I'm pretty sure he could have done a lot better if he knew what he was doing. Judging by the pics (I could be wrong) he doesn't look to be overly experienced, and any Hummer owner can tell you they suck terribly in mud. They do well in sand, though, if you know what you're doing! LR
'09 Ford Ranger FX4 with a mean owner