I wonder how many of these reviewers are lying in their reviews. I can't recall which one it is off the top of my head but one reviewer said he jumped in a jeep with a korean solider in the gunner position and then drove it into a tree to blow the jeep up and kill the korean. I guess he didn't get the memo that says you can't get in a vehicle with an enemy still in it.
BTW, I fired up the game again yesterday afternoon after I beat it and basically loaded up the game from where the demo ends and I took my time finding alternate routes to approach the objective. Spent easily over an hour at this one location. So much more satisfying IMO. I can easily see this being a very long game if done this way.