Mike Tyson in his prime one of the greatest or not

Mike Tyson,the youngest heavyweight champion,50-6 44KO.There is the question,does he belongs with the best fighters ever,in top 5,top 10 heavyweights ever.His critics are saying that he fought in weak era of heavyweights,that he lasted short and had some questionabled performance.In my opinion in his prime he was closest to unbeatable of all heavyweight champions.I considere Tysons prime from 1986 to 1989,fight with Bruno.He changed trainer Kevin Rooney and after that he just wasn't same fighter.I will compare his prime to another all time greats Muhhamad Ali,Joe Louis,Rocky Marciano,Larry Holmes...And all of them had harder fight than Tyson.Ali had flored vs Cooper,had close fight with Doug Jones,Joe Louis flored vs Jim Braddock,Tonny Galento and had difcult times with Billy Conn,Rocky Marciano flored vs Joe Walcott and Archie Moore and had controversional decision vs Roland LaStarza,Larry Holmes flored vs Earnie Shavers,Renaldo Snipes has hard fight with Ken Norton.I cant remember heavyweight champion who was more dominant at three years than Mike Tyson.My conclusion is that Mike Tyson in prime was top 3 heavyweights ever.Of course this is his prime which lated short and when i considered whole Tyson career and other all time greats heavyweights he is in top 10.