I was regripping a set of irons for a fellow, and noticed something odd about his Sand Wedge. The lie was 3 degrees flatter than his Gap Wedge. On closer examination, I noticed his shaft was bent right near the hosel. It had picked up a kink in the underside of the shaft, likely from being forcefully bent over something at one point. (I didn't ask.

).
So when delivering the clubs, I asked the fellow if he'd noticed anything odd about his Sandie. "Yes", he said. "For some reason I just can't get the face square anymore, because everything is going right." So I showed him the club, explained that the flat lie was the reason for shots going right, and asked if he wanted it fixed. "Yes please", he said. "Can you reshaft it for me?" Well, long story short, he now hits it straight as a die, and his sharper short game lead him to his best round of the year so far when he played with the reshafted club again for the first time.
So yes, lie is very important for directional control, especially in your short irons and wedges. Get your lies checked if you haven'd done so. They don't necessarily come correct from the factory. There is a +/- 1 degree tolerance. Same for loft. Get them rechecked again after a fair bit of playing too, especially if you play with forged clubs, or softer steel cast clubs. You'll be glad you did.
Sean Baines
Clubs That Fit
Richmond Hill, ON, Canada
info@clubsthatfit.cawww.clubsthatfit.ca