4. Stan Lee
I can already hear the gasps. Yes, Stan Lee, the man who created the X-Men, was also one of the X-Mens worst writers. As I mentioned before, Lee may have created the idea of mutants as an allegory for minorities, but he didnt do very much with this. His run only lasted for the first nineteen issues of the books history, and although he created Magneto, the character was extremely underdeveloped by him. In the early issues of the X-Men, Magneto was not the tragic character hes come to be regarded as, but rather a stereotypical comic book supervillain. Even his history of being a Holocaust survivor and an old friend of Professor X came from Claremont. The entire period was extremely unremarkable. Despite the introduction of Magneto, the Brotherhood of Evil Mutants, the Sentinels and the Juggernaut, most of the X-Mens foes were easily forgettable mutant criminals and alien invaders. Even among X-fans, this era isnt regarded with any particular fondness. Towards the end of Lees Silver Age Renaissance, some of his later concepts didnt really get the same attention he devoted to the Fantastic Four and Spider-Man. And some of those, like the X-Men and Daredevil, suffered as a result. Although Lee did create some famous characters, they were fairly one-dimensional under his pen. The work of developing these characters mostly fell to future writers, particularly Claremont.