I rented it about 10 years ago. It was late and I needed to get up early the next morning to teach a few cello lessons. I made the mistake of popping in the movie, thinking that I would only watch a few minutes until I was sleepy. Three hours later, I finally turned in.
The next morning I was very tired (but inspired!).
In his most recent blog, Roger Ebert calls Hoop Dreams "the great American documentary."
Here is the original Siskel and Ebert review.