My drafties are all crosses, so I can only speak from my own perspective. My gelding Claymore (in my avi) is a bit of a spitfire, but he can mind his manners well enough with a beginner. My mare Freyja (1/2 Shire 1/2 Paint) is a total, total dead head, lazy as they come, you have to wake her up to make her move. My two year old Finn, (3/4 Shire, 1/4 Paint), son of Freyja, is willing enough to go, but you do have to make him. He is level headed and very easy to handle. My other drafty, Finn's full sister Fiona is a spitfire again, and has a LOT of pep, she's the one out in the pasture tearing the place up and bucking and kicking up her heels 24.7. But she's just a yearling, she will very likely level out more with age. I do think drafties are more inclined to be laid back, but each horse is individual so as with anything there are no guarantees!