Your most hated character(s) of all time

[Coola Yagami]

Slash was more naive that flat-out dumb in his his first episode. TMNT_guy analyzed the episode perfectly. The Turtles had years of training and whatnot before they met April, and even then they were making niave-ish mistakes like Don not knowing how to use the answering machine and whatnot in April's apartment. Slash was mutated that very same day. Plus, he was able to take down all 4 Turtles by himself. They couldn't beat him in combat, they had to trick him to get rid of him.

The deal was the other episodes he was in. In 'Donatello trashes Slash', they were already rippin on him before he even appeared in the episode. And yes, the episode was all about how 'dumb-as-a-brick Slash' was now a super-genius, but he never acted THAT dumb in his premiere episode to begin with. Such an idea would have worked better with Bebop and Rocksteady who were already clearly established as morons. Then in 'Night of the Rogues' he became just another bad guy to get beaten with no problem, and acted extremely dumb to keep the whole 'Slash-is-so-dumb' thing they started with the last episode.