With 6 Underground, it wasn't so much the incoherence of the plot that ruined it--that's to be expected and isn't why we go to see this type of movie--it was the incoherence of the direction, especially in the action scenes. The car chases were all over the place: with each cut the location changed and bore no connection to the prior location, so there was no flow to the chase and you had no idea where anyone was or how they were doing. All the explosions were good, but it was too much hard work to understand what was going on.
With all the money and the experience of the director, it's an achievement to make such a bad film.