I switched the controls around to have "up" as move forward, "left" and "right" as turn, with "L1" and "R1" as strafing left/right.
I usually do a diagonal strafe-run (like in GoldenEye on the 64) to get around. It works pretty well. It also gets more fun once you start to get some upgrades.
I really hope that they release the second game on the PSN before the 3rd game comes out.