The Ghost is good, but their is one big weakness to it that when vehicles are involved I often seek out, either use the energy drainer or a charged plasma pistol and the ghost will just sink to the ground, also all it takes is one person to jump on boared and it has been taken. Personaly I like the Warthog, for one if it is drained the gunner still has a good ability to shoot, also the unpredictibility of its driving makes hit and running quite easy. Also in campain even the chopers are not as a carier warthog that is filled with people with powerful weapons.
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Through dream I travel, at lantern's call
To consume the flames of a kingdom's fall