Traffic in L.A. is so bad during rush "hour" (which lasts several hours) that you can't travel by car faster than walking speed. It routinely takes 30+ minutes to travel 3 miles or so. Car is your only option in most locations.
The state would benefit from a solid metro system in L.A. FAR more than one between L.A. and S.F.
I can only hope that this metro will link Downtown L.A. to West L.A. and spur local metro development.