My two cents on LA... I loved it there. However for doing all the touristy bits, i was on a motorbike, which allowed me to slice thru all the traffic, get to all the nice spots, and I was with someone who had previously lived in LA, so knew the best spots to go to.. Which included, Santa Monica, Angeles Crest, Downtown, Redondo Beach, Hollywood, Beverley Hills.. + lots of other parts.
Actually I rode for 12hrs straight every day for two days, and on a sports bike.. At the end of the last day, my clutch hand was killing me, but i was enjoying myself so much, that i just rode thru the pain. If you know how to ride, you can rent a nice bike for $150 a day.
I also went to a couple of bars, which had lots of atmosphere and a decent buzz about the place.
LA is like London, you can spend hrs upon hrs, sitting in traffic, at look at nothing apart from run down s-holes, or if you know where to go, hit those places hard and fast, (except in LA, it includes canyon roads, 6k ft elevation views, and blue azur skies) and if you get it right, you'll walk away with some pretty decent memories. Its' huge ! So i can understand, why some didn't get a feel for the place.