I'm probably biased, but Contreras should definitely get MVP votes. I can't name 10 better guys this year. I don't know if I can name 5 who have been more important to their respective teams.
Fangraphs has Contreras 9th in WAR (in the NL). 7th among position players. It's Betts, Freeman, Acuna for me, but, after that, you can make an argument that Contreras is right in the thick of that next group. Bonus points for playing a premium defensive position. He's also putting up a 125 OPS+ in a lineup without much prowess.
He's not the MVP, but I'll go so far as to say it would be a travesty if he weren't on a whole lot of ballots, especially considering that he very much fits the "most valuable" part of equation when thinking about the Brewers.