Frank is the funniest - there's nothing better than a drunken intellectual no-hoper... his stuff is witty and poignant at times -at others, witless and pointless - yet he throws his opinion in whether or not it's wanted (a bit like me there).
He's had some great scenes too - the fire scene from Ep. 1. of series 4 is priceless... as is the scene where he's finally p*ssed again after being on the drug trial.
N.