the only annoying vehicle is the ghost, if they keep u at bay whilst firing at u, ur gonna die without being able hijack them, or u can keep running sideways and lob a grenade behind him nocking him close to u, u can then hijack or u can waste him whilst hes spinning. warthog is easier to take down if u see it comeing, just equip a shotgun get close as u can and shoot the driver, lob a grenade jump and kill the gunner, if theres a passenger he wont stand mush damage as the grenade will have taken off sum shield then just waste him. the banshee takes 1/2 shots at close range to kill the driver, and to get close just crouch behind sumthing and they will drive near u, pop up and hijack them. anti vehicle tactics. not played against the spectre yet, the wraith and tank are nub vehicles