On pc, they were next to impossible to use. Over simplified and difficult only because they didn't give the player enough control, not difficult because they were hard to use.
Keyboard steering meant over-steering on everything except mini vans.
APC's seem to be impossible to use on roads as they jerk left and right with intense over-steer.
Helicopters are ok, but using the weapons on them will be difficult given you can't maintain pitch.
Planes are way too easy, some yaw would be nice, but i guess to make planes accessible keeping them simple works to our favour.
Bikes throw you off for almost no reason.
Even when using a 360 controller, instead of giving me gradual increments of control, it seems like it had 3 settings; no input, 50% and 100%.