Traction control is fine until it throws a hissy fit, you get the "3 bongs" and are left with nothing - not a major drama if you are in a muddy field 20 yards from the road, rather more so if you are in a muddy swamp 20 miles from anywhere
Actually I don't rate it highly even when it is working, because the wheels need to be spinning for it to operate and in a lot of off road conditions, that is exactly what you don't want because once you churn up the surface you might as well give up. It's very good on snow and ice though.