I've been fascinated by sieges for a long time -- probably because of it's move-countermove quality. My regret from TW games is not the plethora of sieges available for non-autocalc play, but the repetitive fotresses being assaulted. I've always wanted to have a go at some of the classic fortresses of the era or defend Valetta against a host of Jannisaries.

Oh well, most of the rest of the TW org would loathe it.