Shifting power levels

[Yabuturtle]

Does anyone notice this like in the 1987 cartoon? I noticed that sometimes the villains will be very competent in some episodes and at other times, they end being push overs. I remember Shredder usually running away and fighting sometimes. Sometimes he would hold his own or get pushed aside or he would actually defeat them in combat, like in the episode The Incredible Shrinking Turtles. He actually defeated all 4 of them and rather easily. I remember Krang fighting both Don and Mike and doing quite well, tossing them aside, until both Turtles pushed themselves harder and eventually defeated him and in other episodes like Super Irma, he gets taken down by Leo with little effort.

Even with Bebop and Rocksteady, there were episodes were they were actually a threat and other times, they are just push overs, even being physically defeated in direct hand to hand combat. Although I heard Shredder is supposed to be more talented than the turtles and that only Splinter is on par with Shredder in most series.

I just find it weird on how these battles can be so inconsistent where one minute they are a serious threat and they are push overs in the next episode. xD