In a way this was a return to form for the series. After the frustratingly overcomplicated part 3, in which a bunch of random parties all used John as pawn for their own goals as a very unmotivated way to get to the next (damn great) action scene, this one goes back to a nice, simple "John wants one single thing but has to kill a bunch of people who try to stop him" plot.
Sadly they still wrote themself…