A few years from now nothing you do in this game will have mattered. Your rank, kill/death ratio, win/loss ratio, will get you no where. So, if your going to play the game, do it for the enjoyment.
The ODST Banshee is a lot like the Halo 2 Banshee. It is a little too overpowered for matchmaking. With the slower coasting speed it gives you more time to aim down your target an easier to get kills. The Halo 3 Banshee is perfect for Matchmaking.