I've found myself playing almost exclusively as Engineer. I'd like to try Assault or Recon, but there are entirely too many planes and tanks flying/driving around for my liking, so I must explode them.
Which is why the Engi is the best: Anti-air missiles, a good primary rifle, and I can still melee tanks to death. Love it.
I've never had any luck trying to kill a tank with a repair tool, they always either drive away or get out and shoot me. But when I use a tank I have proximity radar on it, so no one can ever sneak up on me either. I've found proximity radar gets you *way* more kills than autoloader does, since most inf assume you have autoloader and try to get close to you. And I can still take out other tanks by alternating between tank shells and guided shell.
Although if this patch stays I likely won't be playing much anyway, it's ruined my favourite part of the game (helicopters)

They added extra sliders for flight control sensitivity and joystick sensitivity now. Maybe it has something to do with that?
Fiddled with that and got nothing. The TV missile problem seems to be universal, but only a few have the jerky heli controls. It's either a problem with mouse input or micro lag, but no one has found a solution yet.
EDIT: Nup can't play any more...no fun getting shot down every 30 seconds and dealing with jerky controls ._.