I don't know if I see hate for it so much as dispassion for it. A lot of people tend to overlook it in favour of encouraging people to go for the PHB or the Starter Set. (I believe that somebody new should be pointed to the Basic Rules, as it serves as a good means of "Try before you Buy." The Starter set is mainly for if you want to learn how to DM.)
That said, I agree that the Basic Rules on their own can actually be great fun. I haven't had much of an opportunity to take advantage of it, but it is.
On a similar note, I see a similar level of dispassion for the pregens in the starter set. Everybody makes their own characters, it seems. However, half my group of 6 is using the pregens (originally we had all five pregens, but then two dropped while another 3 joined) and it's been as great of fun as if they made their own.