Hey wow, I completely disagree with that. I think not only is Robin unnecessary, but he is in fact a liability, and tends to drag things down. I read Batman comics fairly regularly throughout the 70s, 80s, and 90s, and I don't ever remember a great Batman story that featured Robin. I even hated him on Super Friends.
Batman works best on his own, not with Robin, not with Batgirl, and frankly, not in the Justice League, either. Just my two cents.