Wait a minute...when and how did Shredder become an android? So, what, like they combined Shredder and Krang into one super-entity or something? Can the turtles still beat him? They used to own him up pretty badly in the cartoon - hell, Leo on his own could beat Shreder most of the time. Even Raphael did it once. And Splinter made a habit of it. When did Shredder become this uber-badass?
in the new series, shredder is an uber-badass. I don't know if you ever read any of the original BandW comics but the character portrayed in the cartoon is far more similar to that than the old cartoon incarnation.
So far shredder has been able to dissassemble the tmnt in just about every one of their bouts. He pretty much humiliates them with ease. The turtles have beat him by using his own weapon against him (the sword of tengu, think of some uber samarai sword with all the powers of he man) and allowing him to defeat himself. Shredder also tangled with a triceraton and only lost part of a leg due to impending circumstances. The new shredder is basically what you said about krang in an android body, However he's studied his martial arts to a point where he exceeds even splinter at times, and the strength of his armor is enough to shatter solid steel. he's tough.