The ghost is a Covenant vehicle in the Halo series. It's fast speed, and weak firepower makes it a vehicle that can either be used effectively or become abysmal when used improperly. I didn't get many chances to use one in Halo: Combat Evolved.
Though it was my 2nd favorite vehicle to use in Halo 2. I loved using it on the Zanzibar map. Just grab one off the beach, and try your luck. I would love making it speed up to see how many players I could run into.
It was decent in Halo 3, but not really the best choice.
I hated it in Halo: Reach. It was awful on the maps, and the power of the blasts were even weaker than before. I could do better on foot.