For his faults as a writer and/or director, I give him big points for his awareness and ownership of the film.
Especially this quote: "...If the lesson you’ve learned is that you had the wrong date or you didn’t have good marketing--that’s not a lesson.”
Far too many members of Hollywood grasp at desperate answers to why their project failed, as though it couldn't possibly be the film itself. You can't fight disinterest.
And if nothing else, Kinberg gave us Days of Future Past. Which I enjoyed the hell out of. And for all The Last Stand's faults, it has Kelsey Grammer as Beast saying, "Oh, my stars and garters." And the scene where Magneto fucks up an entire convoy and then coldly abandons Mystique for no longer being "one of us." Plus that great scene where Magneto flips shit on Pyro for celebrating Xavier's death. "Charles Xavier did more for mutants than you will ever know. My single greatest regret is that he had to die for our dream to live."
The Last Stand got a lot wrong, but it got a lot right too. I'm more than willing to re-watch it to get from X-Men/X2 to First Class/The Wolverine/Days of Future Past/Logan. Whereas I'll never watch Origins: Wolverine or Apocalypse again.