Operation: Endgame is a mayhem thriller which neatly orchestrates the ingredients of two teams of assassins trapped in a building which is about to explode, literally at each others throats and facing oblivion.
To be brutally honest, you are unlikely to be watching this film again and again. The premise is spicy enough, but you may well guess the ending before you get there, which really robs it of its replay value. On the other hand, for what it is, this is really quite clever, makes some interesting points on the way, and joins the dots of the fight scenes neatly enough. These are decisively done, and get a lot out of the makeshift nature of the weapons the assassins are forced to employ against each other.
Great for a late evenings viewing. It will never be more than it is, but what it is is thumping enough.