Rookie players don’t have a huge effect on fantasy rosters, which are largely predicated on the performance of players in previous seasons. But it can be helpful for fantasy managers to keep draftees in mind, especially ones going to teams where they will have an immediate opportunity to make an impact. (Andrew Luck, for instance, is going to play immediately for the Colts).
Plus, it’s a self-selecting group. If you watch enough football to be an effective fantasy football manager, you’ll probably miss football enough to watch the draft.