Two points that you have to mention the fairness sake:
1) The camera is not a sport / action camera. For this purpose, the AF is not suitable. Who needs to rely on a reliable AF with fast movements, the operator better the 1D Mark III, possibly the new 7D or Nikon D700, the disappointment will be otherwise very large
2) If you think that the 5D Mark II is a replacement for a compact video camera, the wrong. The 5D Mark II is more of a movie camera that something is on a stand, thoughtful lighting and scenery along with a Follow-Focus for real filmmakers or those who want to be there. Drivers who just wants to do his holiday in order, will be mighty disappointed. An external microphone is a must, because image stabilization and not touch the camera with otherwise get on the soundtrack.