I don't understand how his career can be called a disappointment. Kovalev is a member of 1,000 points club and has a Stanley Cup win on his resume. Look at some of the players that are getting close or fell short of that level to put a context about this achievement alone. Keep in mind that he was not a center and then take a look at some of the names of his non-center contemporaries who also close to Kovalev's production. MSL, Elias, Fleury, Marleau, Hossa. Unless your expectations for Kovalev were in the Iginla, Brett Hull, Selanne range can't call his career a disappointment.