I read your comment you said he had a “very good” career. He played 11 seasons, far longer than the other players you mentioned. He was drafted in 1973 and by 1977 he put up 20 sacks. In 1978 he had 14.5 sacks. In 1980 had 12.5 sacks. He never had fewer than 8 sacks until his final season in 1983. I don’t see where he declined real fast. Deacon Jones and Bruce Smith were on another level than Harvey Martin. It had nothing to do with drugs and alcohol. You could very well spin the same thing about Michael Irvin that he would’ve been thought of in the same light as Jerry Rice had it not been for his marital problems and drugs.
How are Martin's 11 years "far longer" than Bruce Smith's 19 years and Deacon Jones 13 years?
I understand he had those great sack seasons. That's why I say he could have been considered among the elite pass rushers ever had he stayed at that level longer. He did not maintain the consistency over time the way Bruce Smith and Deacon Jones did. Bruce Smith, for example, had 13 double digit sack seasons.
As for declining real fast, he had 8.5 sacks in 9 games in 1982 and in his last year of 1983 he had 2 sacks in 16 games. How would that not be a rapid decline?
As for his drug problems contributing to his demise as a player, Martin retired because he refused to take a mandated drug test, and he subsequently admitted his cocaine addiction.
As for Michael Irvin, I wouldn't say he would have been thought of in the same vein as Jerry Rice. I feel Martin could have been thought of in the same vein as other elite pass rushers. But that's my opinion If you have a different opinion, so be it. But one thing to note is Michael didn't retire because of drug problems, he got injured.