Ren built it but of course he's not a Sith. There's a big rumour regarding his family, as well as Snoke potentially having a familiar alter ego. This is turning out to be better than anyone could've hoped. Still won't slag off the prequels though. Cheesy at times, poor in parts but they play their role as necessary.
What was the role that they play?
They are poor films who if they didn't have Star Wars on the front of nobody would care about and would have flopped.