I only rode one bus during my time in Los Angeles, up Western from the Expo Line to the Red Line, but saw plenty of them during my few days there. I can see quite clearly where WMATA's current paint schemes come from (though I wish WMATA didn't adopt their current schemes, I'm not a fan at least). There are certainly a lot of buses in Los Angeles, but in deciding whether to rent a car or not, came to realize that with the exception of certain origin/destination pairs, relying on buses in Los Angeles is not really feasible, and therefore, many drive. The system is also not set up well for tourists staying outside of downtown LA from what I can tell (I stayed with friends in Pico-Robertson). LA may be making strides in expanding its public transit network, but it still has a long way to go.