It´s not that vehicles have become weaker, but that player characters have become so much better armed, armour abilities and able to sprint.
It doesn´t matter how good or paranoid the vehicle driver is - I can and I do effectively hunt or ambush them down and either hijack or more oftenly blow them to pieces.
Warthogs are free double kills, the rare 3-manned hog is just a delicious treat of medals, waiting to be claimed.
Banshee has been dumbed down and made clumsy.
Permanent vehicle damage is still in, even easier to cause - especially the flaming’ sparkling critical state where a single hit blows it up, despite occupants having full shields. Still remains.
With the DMR being hitscan, freed of bloom, having a faster rate of fire and being deadlier and easier to use than ever before, along with players no longer being zoomed out when taking damage.
Mounting a warthog turret is suicidal, and ultimately you´ll do more damage to the enemy team and earn better by hiding behind a rock and taking DMR potshots like every other git.
The Gauss-turret is the one exception, but again. The life of a gauss hog is short. Lest everybody is indeed hiding behind cover with DMRs.
Plasma Grenades, Pistols as starting weapons. No zoom out, bloom and higher rate of fire on DMRs, armour abilities and sprint.
- The weaknesses added to vehicles by Reach.
Leaves vehicles indeed vulnerable and far from what they used to be. Sure the ghost is mostly deadlier than ever, but at the same time - so are the simple spartans more elusive and better armed.