Well the ****ty Snoke reviews would show otherwise
Fans don't know what they want. It's the common theme of anything Star Wars related. Ask majority of Star Wars fans who hate the prequels why they hate it. Odds are because it's too dialogue heavy is a leading cause. So they don't want too much exposition. But they want exposition when it comes to backstory of snoke, etc? Come on. Some rules of film, show not tell, accept that things happen off screen, and cut out things that don't really matter. What doesn't really matter is that we know who Snoke is. Snoke's purpose to the story is the corruptor and leader of Kylo Ren. In the classic star wars tale his job is to be the big bad for the hero to kill or the final obstacle for Kylo Ren to overcome depending on what direction you want to take the film.
So do we need a whole ass movie to set up who Mitth'raw'nuruodo is, or is seeing a competent villain who's both ruthless, efficient, and dangerous and accept that he's a dangerous mother****er who's job is to be dangerous to the heroes.
Again, consider the OT, what everyone considers the holy grail of star wars. What information do we know about these characters from the films.
1. Emperor Palpatine
2. Darth Vader
3. Grand Moff Tarkin
4. Yoda
5. Obi Wan Kenobi
So here's what you know.
1. Palpas was the big bad leader of the big bad empire. Most powerful darkside user, more powerful than Vader.
2. Vader. First film you know he killed Luke's father (sets up motive for Luke to act against him) second film you find out he's Luke's father, third film you find out a bit more about the emperor corrupting him.
3. Tarkin - Somehow outranks big powerful badguy who kills people. Why or how? Who knows.
4. Yoda - Superpowerful Jedi who trained Obi Wan
5. Obi Wan - Knew Luke's father. Was a jedi who fought in the clone wars.
What information is provided is minimal. Why people like these people is their actions on the screen, not because their massive backstories, those all came much later.
Snoke would have had the same thing if Star Wars fans weren't fickle idiots. Disney unfortunately screwed the pooch by not going with Trevorrow's script. Of course we've discussed ad nauseum about how they should have had an overarching script.
Imagine though instead we get Trevorrow's script, then later get Snoke's backstory in a show, comic, future film, etc.