The dirty little secret of LA is that transit there is actually pretty good. They have trains and subways and buses. A lot of buses! The buses are good. But LA is big and sprawly and in too many places (not all places!) even when the transit is good the walking is not. Mass transit rarely brings you door to door, but the "last mile problem" or certainly the "last half mile problem" isn't actually a problem if that last half mile or so is a pleasant and relatively efficient stroll.
It's standard (and correct) to say that mass transit decisions are too often made by people who would never ride any of it. It's also largely true that it's made by people who never walk anywhere, and walking is always a critical complement to a decent transit system. Improve your sidewalks. Add more crosswalks. Lengthen pedestrian signal times. Stop giving ridiculous tickets for "jaywalking." Do give tickets for crosswalk blocking and bus lane parking cars. It isn't hard.