Hmmm, yes and no. They're fine for doing light work, and they make a very gentle and safe mount. However, these horses were not designed to be ridden. They were designed to have pulling power, ie: a strong back, deep chest and relatively short legs in comparison to their body. Therefore, shoulder and hip movement is a little restricted, so long periods of cantering or galloping and too much jumping can really damage them. If you can find an extra-wide saddle to fit one, and you don't intend to do much more than hacking, then drafts would be OK. But there are heavy-type horses, such as cobs, which possess the gentle nature of drafts but have the ability to gallop and jump high.