You wouldn't know it, but LA has a pretty decent transit system, in terms of one that can get you most places you'd want to go. It's largely bus-based, and can take a while, but it is effective. Compared to some mid-western and southern cities, it's worlds better.
I'll grant that it may be good by US standards, but that is sort of damning it with faint praise. Yes, it is good in the sense that you can get anywhere you want to go, eventually. When I say good, however, I mean comparable to driving in time and convenience.