My $0.02

Drag Racing = fun for a few runs maybe then.. YAWN....the steering wheel and brake pedal are on the car for a reason

AutoX = I could run dawn to dusk and not get bored with it because there are many areas to improve in..... entry angle, entry speed, braking, etc. These are timed runs.

Drifting = I've only watched and really have little to no interest in participating due to the cost/wear and tear involved and like Scott pointed out, no hard numbers, it's "judged" or whatever they do.

I'm also going to go with.....

Drag Racing= 75% car / 25% driver
AutoX = 25% car / 75% driver