I'm not so sure it'll be that fun. Under 5th, you'll take out three squads, and then find your 'Zerkers standing dumbly in rapidfire range of half an army. Most CC list will have more guys than you, and may the Dark Gods of the Warp help you if you face something like IG or Tau. In fairness, though, I think it'd do very well against more balanced forces. And Kharn's always fun. KILL, MAIM, BURN! KILL, MAIM, BURN! KILL, MAIM, BURN! KILL, MAIM, BURN!
Four Colditz salads and a Hermann Goering.