I don't think they're poison, despite writing 2 out of 3 awful Transformer's movies -- a black blot on their resumes, if not their souls, to be sure. Kurtzman and Orci have been involved in some good television; cf. Hercules, Xena, Fringe, Sleepy Hollow.This is not an irrational belief: Kurtzman and Orci are poison. They are like Lucas since the late 90s, only worse. They have destroyed everything they touch.
Heck, I loved their first Trek movie, and liked the second. I do wish (parts of) the scripts were better. It's those bad parts I attribute, for no real reason, to Orci.
Basically, I just wish the studio would have brought in someone new to the current franchise. I'd like to see something different in the 3rd film, something more science-fictional, perhaps. Though I admit that might not be a reasonable hope for a Trek film meant to be a big summer blockbuster, ie the only kind a studio will actually film.
Which is why what I really want is a new TV show.