I really don't see what the problem people have with the monsters on Han's ship, I mean have they seen ROTJ?
JJ gets attacked when he uses things we have seen in a star wars film before, and attacked when he creates something new.
I even saw someone use the excuse "it doesn't look like anything we have seen in a star wars film before", well isn't that true of everything we have seen in a film that wasn't in ANH? Like Wampas, Mynocks, Uganauts, Tauntauns, and all the things in jedi designed to sell toys, regardless of how bad they would look in the actual film.
Gamorean guards anyone?
Regardless of what those monsters looked like, the fact that Han just cold bloodedly just shoved a guy into its mouth is well on its way to erasing the memory of the Greedo shooting first travesty.