I just don't understand the point of transportation in most random matchmaking games. Rarely do people elect to work as a cohesive team. Usually, it's two people who run around or others who go lone wolf.
I see transport serving purpose in games like Battlefield 3, but maps aren't big enough and the gameplay doesn't cater to the slower moving tactical gameplay, rather quick, think-on-your-feet style of tactics that Halo usually offers.
I'd like to see a new vehicle make an appearance, one that allows for more weapons capability rather than transport.