Why did the TMNT kick the butt of Shredder so often in the 1987 cartoon?

[Archon_Turtle]

Originally Posted by Slap-Happy

I wish the Shredder would've won in some episodes. Makes the plot a bit more interesting.

Shredder had many many temporary victories. In fact his plans usually succeeded to an extent. The Turtles had to undo what he did more often then they actually prevented him from doing something.