I took Kevin Garnett, one of the greatest players of our generation, and asked www.basketballreference.com to compare his stats through 14 seasons with those of Hakeem and David. Result -- no contest, those two guys were WAY, WAY better.
While KG is a better passer than either of these two, he holds no other significant statistical advantage. Robinson and Olajuwon basically double KG's blocks per game number AND they outscored him AND their PER rating is better.
Robinson's greatness as a player is cemented by the fact that of the three great players, he had the best Offensive Rating (116 points created per 100 possessions) and the best defensive rating (96 points surrendered per 100 possessions). He also is #8 all-time in Win Shares (despite the fact that he entered the league at age 24 and played only until he was 37. Every guy above him played many more games.
Summary -- KG has been excellent, but still nowhere near the player than the other two guys were for their first 14 years.