I really don't get all of the negative focus on the lack of backstory for Snoke. As has been pointed out we had ZERO backstory for Palpatine in the OT, which didn't seem to bother anyone at all. That being said, I would have rather seen Johnson spend the time he wasted (IMO) on Cantonica and the Code Breaker sidestory fleshing Snoke out a bit. Not a dealbreaker for me at all however, and I thought that the Ren/Snoke/Rey scene played out extremely well. I *like* what Johnson did with these three characters in TLJ.