Superstar suffers not so much from having Will Ferrell play a teenage boy, but simply because it is not very funny.
Ok, the good news: Superstar isn't very long, and it's not as bad as Night at the Roxbury or It's Pat. Will Ferrell gives a good performance as Sky Corrigan, and Molly Shannon puts energy into her Mary Katherine Gallagher character.
Now, the bad news: You can't turn a 5-minute sketch into an 82-minute movie, and have a 30-year-old man play a teenager. Life just works that way. Ferrell and Shannon have done much better work, just watch Elf, Old School, Blades of Glory, Step Brothers, or Anchorman and its sequel to find out how funny Ferrell really is, and Shannon's put in good performances on SNL 1995-2001.
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