Really?
One of my main complaints about Halo 3 online is the Vehicle killing. I find it absurd that you can stick a Hog in most places, and the explosion doesn't kill anyone, or at least seriously mess it up. Frag grenades are almost entirely useless too, the barely even put it off course. The Brute Shot does a good job of sending it slightly off course, but it really should do more damage to the occupants.
The amount of times i've hit a sweet spot on a Warthog, with a Sticky, with a Frag, a Brute Shot, and the thing just does a barrel roll and continues on it's way, with barely even any shield damage to it's occupants, is ridiculous. Don't get me started on Ghosts - trying to kill one of those without Rockets or a Laser is a fruitless endeavour. The things are pretty overpowered, and it's made playing Valhalla/Sandtrap Covies an instant session killer.
I'm a huge advocate that in Halo 3, no matter what weapon you have, if you have the knowledge and skill, you can do damage. The weapons are well balanced that I never feel the need to run straight for power weapons, I feel I can engage right off the bat with whatever hand i'm dealt. And I love Halo 3 for exactly this reason. Which is why Vehicle killing is so frustrating. I have sticky grenades, which normally get kills from splash damage alone, and I have the skill to land a grenade beside the driver/gunner. Yet, it doesn't do anything. Again, I have the skill to land a grenade on top of a fast moving Ghost - again, nothing. It feels like the Skill-beats-weapon mechanic just got barrel rolled out a window.