The Starkiller Base superweapon. I don’t know how they managed to screw it up so badly. It shows up out of thin air while Hux talks about it as if everyone knows what it is, destroys the capital of a government that we don’t have any reason to care about, and then gets destroyed. It feels like Starkiller was spliced in from another film.
I felt the same way about it looking like two different story lines spliced together. From the crawl and introduction of BB-8 the story pointed to being about getting to Luke. Starkiller just seemed like an afterthought or a decision by committee.