I wouldn't say lumbering, it does have plenty of power... you do have to pick your lines though, and momentum is both your friend and your enemy!
Firetrack and similar is fine, just let the bike wander a bit. On singletrack, I find it's easier to keep your weight over the front and steer with the back wheel. Lean the bike, not the rider (easier to catch a slide, and less likely to trap yourself underneath if it does go down!)