1. Actually it becomes a competition of who has the better leading aim. I think the strafing is fine. Probably should be slowed down a little for realism but not by much.
I agree if the your opponent strafes in one direction. Then you can find the lag sweet spot and continue firing in that spot. But if they start rapidily strafing back and forth (which they do) then it becomes a competition on who has the best connection and who can spray and pray the best.