I think Flutie-Rob Johnson was the most polarizing.
There were also other very polarizing players and coaches at the time - Rex Ryan, Diggs, Donahue, McGahee - but history proved which side was right (i.e., Rex)
I think there are still some people that think Johnson was the better player than Flutie and deserved the playoff start. Total idiocy.
If the Bills end up stagnating, I think McD could end up being more polarizing. If Josh and Brady win a SB together, however, then McD will fade into history.