My rating of automatics, best to worst:
Mack
Freightliner
International
Kenworth
I'm currently assigned a Freightliner, which I would describe as "acceptable" in terms of it's shifting AND pulling out from a stop into traffic.
We have one auto Mack which is pretty awesome.
The Kenworths imho, are frikken dangerous. Stopped waiting for a space in the traffic, floor that accelerator and count 3 full seconds before it does anything. Scary crap, sometimes you have to abort or you'll cause an accident. Couple that with that damn alarm that starts sounding when you're 3/4 of a mile behind another vehicle... Are you serious? I'm too close?? Before my Freightliner, I was in a Kenworth for a long time. You can back under a trailer without hitting the pin at 30 mph, but it takes time to get used to the vehicle (and they're all probably a little different). You should be letting the air out of the bags before going under in any airbag equipped tractor, and reinflating before you hit the pin.