To be fair, the magpie trying to chainsword that huge-ass Ork walker in this one beats that handily, but I'm more ready to let it slide here since the whole trailer is stuffed with symbolism. DoW 1 trailer was only, and only, fail-tactics.
Eh, if he had a melta or a krak nade, it's not that bad of a tactic. A sergeant or a captain with a power weapon could probably do it too. But a lone battlebrother without anti armor nades it's suicidal.
Still, DoW2 had the best intro/trailer.