There's an interesting argument. Barry Bonds was a Hall of Famer before he started using steroids; he just played the game very differently. He was a mix of speed and excellent hitting, with some power mixed in. He was the second player ever to steal 40 bases and hit 40 home runs in the same season, and it has only happened four times in the history of the game. It was only when he saw all the attention that McGuire and Sosa got during their single season record chase that he decided that he needed to max out his power with 'roids (to the detriment of his speed and body). Bonds was already one of the best, it just wasn't enough for him. He wanted to be the best....and maybe those people accomplished a lot before they started, but that's what happens, I guess.
But is there anyone who can make the case that Armstrong was one of the better cyclists before he started doping?