A little more information would be nice before I made up my mind (not that that's worth much anyhow).
The first time shots are fired in the video I was pretty confused as to why. I read the comments about trying to ram the police cars, but all the driver's actions looked evasive, trying to avoid a collision with the police. Yes, the guy was running, but it looked like he was pretty well stopped when the patrol car rammed into his door.
At this point I felt that shooting was excessive.
Once I saw the officer on the hood, I assumed that the driver was still trying to get away after being hit by the police car and surrounded by officers and other cars. Since the hood of a car seems to me to be the worst position an officer would want to be in, I've got to assume that the officer ended up there after the car was heading towards him, which would justify the shooting to me.