Like Phil said early on, it starts out well, then quickly goes to shit. I don't know how anyone can defend it other than a couple bits here and there(Bruce's Surgeon General, the very end), unless they're just laughing at/with the absurdity of it all.
I haven't seen it since around the time it came out on video, and can't imagine liking it any more now. Sadly, it's been almost that long since I've seen the original as well. I really need to track down the OOP disc with the commentary for that one(no Blu player here). LA is probably my least favorite Carperter flick that I've seen. Yes, moreso than Ghosts of Mars, which is also awful(and I own. Yes, it was free). At least Vampires has Woods, and Prince of Darkness has a unexplainable creepy vibe without being scary(similar to the one I get from Day of the Dead, for some reason).