<p>I took roughly 10 Physics classes, and I never had a single class taught by a graduate students. All of my classes were taught by professors. 3 of tose classes had graduate students leading discussion sections and grading assignments, but I was never taught by a graduate student...and I attended a pretty large state school. </p>
<p>However, I agree that graduate students at top universities can be amazing...as good as professors.</p>
<p>Actually it means that you went to a very good state school. I am teaching physics professionally and i hear stories. As to my own experience in US (fortunately for me I got my physics education elsewhere), I took roughly 15 physics classes myself during my PhD times and about 2/3 of them were taught by good researchers/terrible teachers kind of professors. I certainly knew how to teach quantum mechanics better than some of them. At least I got lucky, I never had to take any labs/seminars led by a Chinese grad student who would not know how to speak English, but I taught tons of them myself (some of these labs with 64 kids in them, can you imagine?). At least I am a pretty decent teacher.
I know that my son will be fine anywhere, he is strong enough to handle any educational situation. But I do want him to have an amazing experience I had at his age, I trully loved my undergrad school. And I really could not care less about my grad school.</p>