What a remarkably weird experience.
I was not raised on the Muppets. I only know the names of maybe three of them. I went into this movie not knowing anything, and then proceeded to pretend that I knew even less to heighten this effect.
What happened was I was thrown into a crazy-ass world of relatively normal humans who are forced to live a life filled with insane, probably magical, goblins that generally just get in the way.