Gooden had one of the best 3 years runs in baseball history. Now for self induced reasons, he did not sustain greatness, but he is certainly as deserving as some of the guys in the hall (Neikro, Sutton). Not that he should go, but just sayin'.
Belle was the best hitter in baseball for 1 year - more than Rose, and for about 5 years, he was behind only Griffey and Thomas for best hitter in the game. He was a total asshole, and he had a short career, but his percentages are close to Rose's and he hit for much more power. Another thing that helps Belle is that it is he has never been implicated for steroids in the juiced era. He has even been called the best hitter of the era that was never on the juice. Not sure how true that is, but writers may look at it.
Rose is one of the most overrated players of all time. Sure he's got the most hits, but he also has the most at bats, games, and plate appearances meaning that he also had the most chances to get a hit. He is Hank Aaron without power.