I don't think they're stupid, I think they're just new. That is so refreshing to watch. Picking up the game for what appears to be the first time and having a great time even while losing is probably the holy grail of new player reactions. It can't be that unbalanced if they are that immersed so soon. If I were TripWire I'd want all new players to react the way these guys did. i loved when the guy got freaked out by the husk and ran the other way, and how the other guy welded the door shut on a crawler because he was scared of it. LOL. They even said verbatim "this game is awesome" at some point during the farm level.
So they lost to Hans and got schwacked by raging large zeds. I didn't hear them proclaim "this game is broken" at all. Like us, they'll likely wanna come back and try again til they get better, level up and beat Hans.
I am of the rare few that actually like Hans in his current form, with the minor exception that it would be nice to successfully get his attention when he starts chasing down a teammate, because that always ends in a death. Otherwise, I just take comfort in the idea that if you think of Hans as another player, it is obvious he is doing exactly what we would do if we were him fighting us. Hans has joined the likes of F.E.A.R. 1 Extreme Mode enemies and SEO in what is a small but growing fraternity of computers you have to go out of your way to treat like people in order to get the desired result.
One thing this indicates though is why it is important for flashlight and NVG battery life to be extended, because without good lighting, the video would be kinda hard to watch. It must have been a challenge to cut out darkened parts of the video that had otherwise great dialogue. Who knows what we missed?