Yes, it's a bug. Anything that over-powerful is bugged. If the Soldier's shield was wrong, this is too. It's logically impossible and impractical to allow such as bug to go on. There's simply no logical reason anyone can give as to how someone can root you in your Yalmaha, suck you down to the ground, and then proceed to terminate you.
Since we are not allowed to defend ourselves in our vehicles, I think Funcom has only 2 choices - Either allow us to retaliate from the vehicle (and I don't mean give me machine guns or plasma cannons (though a nice pair of fuzzy dice would be good)), or eliminate the ability to root players in vehicles.
Since removing the ability to command pets from vehicles (due to exploiting/abusing it) and prior to the patch, there has been relative peace. But now, dare you venture into the wilds, you might get a nasty surprise. Those that can root, will. And soon you will find that the ground that was so far below is now stuck to your butt, and the lofty sky above is but a fading dream as you drift silently into that reclaim in the sky.
And this should apply to all vehicles. If you are in your vehicle - you can't attack, nor be attacked.
That alone should end all my days of getting gobbled up by Vultures...