This is definitely a movie made more powerful by watching feel good, "safe" showbiz biopics like Bohemian Rhapsody or, specifically, 24 Hour Party People (that also features the subject looking back at his life). If you haven't yet, I REALLY don't recommend looking up anything about Doug Kenney before watching this movie.
Having watched it the way I did, I can definitely recommend it. Even though I thought much of the humour was kind of weak and Will Forte can come of as obnoxious in many scenes. It's worth your while.
Having said that, MAN are those wigs bad. Especially on Joel McHale.