the ending was a bit unsatisfactory, like, before starting the movie you basically know they're gonna get together, break up, and get together again. But just because the last part is a given doesn't mean you can skip it altogether.
There's some really pretty shots in the film though, it's good that the cinematography was able to tell a story because the dialog wasn't really there. I overall liked the movie, just it could have had more actual interactions between people that included words.

none of my questions got answered by the end, I'm still confused as to why they were in a maze. Why a maze? They were chosen because they were immune to a disease, why were they all men? Was Thomas supposed to go in? I'm just very confused at the end of this. I hope the sequel answers my questions.

no. He gets sexually assaulted and then falls for his assaulter. That's not a lovestory that's a victim who doesn't know how to deal with what happened.