Well, it really depends on which lecturer you get at the lecture you go to, but generally, these lectures are pretty good.
I am going to warn you though that most of these lecturers do not speak english fluently. Therefore if you're not used to a certain foreign accent, you're in tough luck. At almost every lecture, all the professors there do not speak "American English" as it's often referred to. Does that mean that good chemists are never American? I don't really know, but it would be sad if it were true.
Since I'm only a high school student though, I can't really rate these lectures on how understandable they are, because wel, there's a lot of information covered that I don't understand at all. I do make the most of it and if I try hard and pay attention, I can get a lot out of it.
ASU isn't quite friendly to people who don't attend their school though, that's why they're getting a 4 instead of 5 stars. Grr.