We've seen this before: 'You killed my [_fill in the blank_], now you must die'...
And plot holes abound. And abound. And abound. I could go into them at length, but some folks get testy about their spoilers.
The 'acting' might have been capable, but was hampered by a very bad script and uneven direction. In several spots, this seemed almost like a cheesy 70s kung fu movie. There's one scene where eight bad guys in a very neat row (none of which have guns) take a turn trying to beat down the hero, and they each have a throw-away line before he curb stomps 'em.
It's stuff like that which makes Last Man Down hilarious in places. Also, some of the quick cuts were actually pretty good.
Oh, and the title. Shouldn't it have been 'Last Man Still Standing'?
If you're in the mood for unintentional cheese, get a bunch of friends together with some beers, a LOT of popcorn, and mentally prep yourselves for a movie along the lines of say, 'Shaolin Hercules vs. the Warrior Nympho Goddesses of Mars*', before queuing this up and it should make for a pretty good time. YMMV.
* To the best of my knowledge, I made that title up. But in retrospect, I think that it might have been a classic...