I'm from the east coast, and just a couple of days ago was out in LA for a vacation. I ended up skiing Mountain High and had a pretty good time. The drive is about 1.5 hours, depending on where you start from in the LA basin, but in all honesty, you drive so much living in LA that 1.5 hours is nothing.
I really enjoyed the mountain. We skiied on a Friday, which was busier than I would have liked, but none the less we had a good time. Nearly every run had some park features on it, which was a very cool departure from skiing the east, and the terrain wasn't to shabby either.
If you're hailing from the interior mountain west or alaska or something, you won't think it's that great. But if you're just an average schmuck like most of us, then there's plenty of skiing in LA to tickle your fancy.
Plus, surfing the Pacific is only 1.5 hours from the Mountain High...think about it!