DeSean Jackson was injured at times and there were some plays where he simply put in no effort. Sure, there were times when he made those long plays pay off. Richardson is not as talented as Jackson, but he doesn't lay down on occasion like Jackson did.
Richardson continued to try to get open whenever Russell Wilson had to scramble and it paid off a number of times. His routes over the middle in the red zone are solid. That speed allows him to get separation over the middle and corners can't keep up with him near the end zone. He will draw some doubles in the red zone as well and that will open up Docton, Crowder, Reed, and Thompson.
Richardson is a solid signing. And it is for five years. No, he is not the reincarnation of Jerry Rice, but this was the right receiver to get. John Keim said Richardson was the number one target at receiver for the front office and the team knew Allen Robinson would cost too much. It pains me to say it, but Bruce Allen did good here.