I think the real problem with his work is that he's completely willing to sacrifice almost everything in favor of whatever scene in the movie he currently wants to happen even if it ruins other aspects of the movie. For example, in The Force Awakens I was generally okay with the story up until the attack on the Death Star (or whatever it was called, but it's the new Death Star so whatever) begins and it fires its huge burst of energy across the galaxy that is somehow going to hit the target in a small amount of time and the rebel forces are also able to almost immediately travel across the entire galaxy while being on comms in real time.
He did something very similar in the first movie of the Star Trek reboot, when Nero destroyed Vulcan. Given how long the Enterprise was in warp before they dumped Kirk off on that ice planet, Vulcan should have been significantly farther away, but instead it was in the same relative neighborhood as the distance from the earth to the moon, because it was more than just a dot in the sky.
I choose to believe that these particular scenes aren't strictly canon, but are dumbed-down, flashier versions of what actually happened (for instance, Spock could have been carrying a portable subspace radio and heard of Vulcan's destruction that way). Starkiller base could have had a way of firing a weapon through hyperspace, but in the movie scene it was more flashy and dramatic to have it look like it must all be happening in the same solar system.
As long as I can come up with a plausible version of what happened that works in universe and still makes sense in the context of the story, I try to just let this stuff slide.