Okay, Prof. Ghez has got some good and bad points, but it's up to you decide which outweighs the other. For one, she's really passionate and you can tell from the very first lecture that she really loves what she does. She's pretty good at explaining the harder concepts in astronomy and she's concerned about student learning, since she'll try to clarify any confusion. However, she is NOT an easy instructor! For an intro to astronomy course, this class was way too difficult and had too much work (labs, weekly homeworks, 2 midterms, a cumulative final). In addition, the tests are hard since they involve mastery of the concepts as well as specific-detailed questions. On top of that, there is a lot of material to cover for one quarter, so one might feel really overwhelmed especially when finals come around. I think if she could just slow the workload, everything would be all cool. You learn a lot, but she's definitely gonna work ya!
Seems like there's been some time since anyone's left a Prof. Ghez eval. Perhaps she's changed since the last one, because she is an absolutely amazing teacher. She has the enthusiasm and concern for her students that 90% of the professors here seem to have left back in grad school. She may be ever-so-slightly frazzled at times, but it just plays into the loopy astronomer persona and doesn't detract at all from the lectures (which any observant student can tell she puts a lot of time into creating). Besides, it's just pretty awesome to be taught by someone as famous as Prof. Ghez in a relatively small class.