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 vehicles are just fine and Bungie is making ti so that it is not a total pain to the player as they drive with maybe two tires. So don't worry. And the rocket is jsut fine how they edited it. Just forces players to be more careful and skillful.