I like John C. Reilly. Is the movie worth watching?
No. Funny premise badly executed, though the songs were well done. What's odd is that Will Ferrell wasn't at least partly responsible (do NOT see their "Holmes and Watson" debacle if you like comedies).
If you haven't seen it check out "Cirque du Freak: The Vampire's Assistant" for a very good performance by Mr. Reilly.