If this can help, yes, AK is unplayable on PC, or at least it was for me. But I played it.
How? Well, I stopped playing after 40 minutes- 1 hour, because the game would crash or become unplayable due to stuttering.
I mean, I had frame drops the whole time, but it was playable for the first thirty minutes or so. After that, the stutter was so bad I need to kill the game and reboot my PC, because it drained all my memory. Even simply using Win 8.1 to navigate the web was very sluggish without a reboot.
Oh, all of this with 1366*768 resolution, 30 fps and optimization suggested by WB, that in my case did nothing at all.
So yeah, there's a lot of work to do, here.
But I need also to report that a friend of mine played the game with no frame issue at all, strange because my CPU is better than the one he has on his PC, while the GPU is the same, a 970.
So it's really random, I think. I didn't manage to run it properly, but I want to play it because t the moment I have not so many games to play (in fact I'm doing some games from Plus, now).