Eh, motion control SUPER BOOST is rarely used and for those rare moments a simple swing doesn't bother me. You're mainly using double tap square boost anyways when driving.
Reverse is a little weird, I just never use it haha. But if I did I'd probably use back R3. I mainly just drive around with square boosting and X sliding.
The game literally ran out of buttons, so the least used things were put in slightly awkward positions. I'm just thankful you don't need to press D,D,U,U to shoot a freeze ray or D,D,L,L to use a shield or whatever the special commands used to be. Having to learn and remember the moves was a bit off-putting.