I'm starting to think that they secretly nerfed the Walker AA gun and Sunderer Deployment Shield, or buffed ESFs so that they can tank an entire Walker load while being able to punch through my shields in the the time it takes to empty the Walker's magazine(about 5 seconds). Plus, the guy(a Scythe) was firing missiles and main guns at the same time.
Also lost more than one Sunderer to the same MAX with a pair of Cosmoses punching through the shield within a couple of shots. Likewise lost another Sunderer to a Lightning that all but ignored the shields. Also ran into possibly two people teleporting just now. One took out my tank(in two or three shots) with a base turret while I was busy with a gate shield generator(Mao SW Gate). As I run back into the shieldgen room for cover, the same guy is already shooting me in the back with his gun, and even before the death screen is loaded the generator is repaired. The other was that last Sunderer that was attacked by the Lightning. I had just taken down a LA fairy that tried to C4 it(failed), and that MAX had started damaging it(I don't know if his shots detonated the C4), so I got in and drove off about 1.5km away. And it wasn't actually the Lightning tank that destroyed the Sunderer, it was the LA I killed before, somehow reaching me from that far away despite the fact that my retreat was in a fairly random direction.
On the other hand, I put a dot sight on my T5 AMC, and managed to nearly solo 3-4 people repeatedly, only losing when they pulled armor and that Cosmos MAX.