I really had a great time in all of my experience with every Halo game with my friends, and even strangers I've found. But being in the same vehicle as one giant mass of destruction roaming through the world is a great feeling. It adds a certain magic to multiplayer, in any game. And with Destiny being such a social game, I believe this would be a great feature.
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I dont think the initial release of Destiny will see any other vehicle other than our shrike, maybe down the road on the 2nd or 3rd release we might if we are luck see some larger vehicles