Yes, Lucas could have done more with the character. Bumping Dooku off so early in ROTS seems a waste. It is to Lee's credit I believed Dooku wasn't dyed in the wool evil in AOTC, and more of a double agent character, if only for a little while.
And The Howling II is a turkey so bad, Lee allegedly apologized to director Joe Dante, (who made the original film) for being in it.
