Jerry Rice may not have been the most talented player to play at his position, nevermind the NFL...but there was no one, and I mean not one that could surpass Rice in work rate. You couldn't beat Rice because he would simply outwork you in ever facet of the game. While he wasn't a speed demon or a player with elite physical attributes as an athlete, he would beast those better athletes on opposing defenses with insane film study, the most precise route running you'll ever see, great vision, and a mind for the game that will simply outsmart you.
It is very difficult to even rank players by position in the NFL over the course of time, considering how ever evolving the NFL is...heck, there are some that would say Jerry is only the best Modern Era WR of all time, while giving major props to Don Hutson as the GOAT at the position. I'm not one of them, but there is a group out there that believe so.