How bad is it? It's one of the dumbest Rambo clones.
Should you see it? Yes, for two short scenes.
Martin Kove plays a Vietnam vet who becomes a cop, then an ex-cop, then gets "unleashed" on the Vietnamese mafia (and their leader just turns out to be his nemesis from the war). Soon Teck-Oh is the bad guy, Sela Ward the love interest and Bernie Casey is on board. There's two great silly scenes: 1) very early, there's a rat with a grenade strapped to its back and 2) in an extended chase, in a kitchen, to stop his bleeding and continue the fight, Kove cauterizes his wound with a hot skillet!