I hated Snoke in TFA, loved him in TLJ. I wonder what I'll think of him in this movie? Oh, wait...
I guess you could make the argument that Snoke was never technically a Sith. But yeah, other than being more lively than the Emperor (and also not a human and also in a bathrobe), your argument is valid.
I disagree. It's a callback scene, but handled incredibly differently from RotJ. Rey never gave any sign of temptation, Kylo never showed heroism. It ended poorly, compared to Darth Vader's betrayal.
Rey and Kylo both thinking the other will turn, the big bad dying thanks to the small bad, the death of the isolated teacher figure, the destruction of a massive Star Destroyer.