Now I was never at E3, but I did see the video with Halo 2. The thing that worries me the most is that the vehicles are going to be too real, that you'll get in one next think you know you tires are poped and you can barley move and then you blow up. And I really don't think they should have the guided missle thing because the rocket launcher is pretty powerful without it.
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The vehicle damage doesn't follow perfect physics and realism. The tires pop, but not from bullets but from just taking general damage to that area. Even then the vehicle will still drive. Better then that, you can take four rockets to your warthog before it blows up providing none of them hit YOU instead of the vehicle. Back in Halo1 you'd be dead on the first rocket even if it just scraped your bumper. Secondly, even if you're in the vehicle when it finally blows up, sure you take damage but it's not instant death anymore. It just stuns you for a moment and you have to bail in case it blows up a second time. In general, a lot more thought has gone into the vehicles this time around.