Compare that to the flow in this version. You can still see power, but it's not "snappy" (which, by the way, is horrible for your joints anyway): http://www.youtube.com/watch?v=h7_syGd3S0o
I agree - first video is pretty bad. His stances are weak. The way he's punching/kicking actually makes him slower. Not realistic and not real power.
The video of John Wang shows good mechanics and precision.