He had 6 winning seasons in 16 yrs. Let us contrast with with Don Shula. In 33yrs., Shula had 26 winning seasons(79%). With the Dolphins, Shula had 19 winning seasons out the 26(73%) he coached here. That is a winner, not someone that has a career percentage of .375 in terms of winning more games than you lose every year. Shula inherited a team that went 15-39-2 under George Wilson. In terms of individual games it is not even comparable, with Shula the Dolphins had a record of 257-133-2(66%) that equates to winning 2 out of every 3. Let us look at Shula's career record of 328-156-6 which goes up to 68%. Fisher barely breaks even winning 142 games out of 262(54%). You might say well Fisher had a winning record in the playoffs, but you would be wrong. He had a winning percentage of 46%. This does not add up to a winner!
Let me also add that Fisher is never going to change. If something does not work, like his style of play, he will try to mold something around it to make it work. I would much rather give someone a shot that has less experience that is going to form a system around the players he has rather trying to make the players fit his system. My shiniing example of this is Jim Harbaugh. He took a team that was abyssmal and identified it's strengths. A year later they are one of the best teams in the league.