One thing that i can't put my head around is that in the final battle scene between Sentinel and Optimus , Sentinel cuts off one of Optimus's arms then pierces his shoulder. How is that he can still kick Megatron's ass when his only arm as been stabbed through the shoulder/arm and he moves it like its fine?
It probably hurt initially, then either he had time to deal with the pain, or dampen his pain receptors (which, admittedly, is a part of "dealing with the pain").
but what about his damaged circuits and everything , i dont know much but doesn't all the wires have to be connected for the circuit board to work?
At least in human computers. But these are not true robots or even mechanical machines as we have come to associate those terms. They're living beings with metallic (metal-like) structures that seem to be able to undergo forms of homeostasis.
Probably similar to humans with adrenaline, I've played football games with sprained ankles and dislocated shoulders, but the pain doesn't set in till a little while after the game is over.
Ironhide took that spear from the dread, and while it knocked his momentum off for about a second, he was immediately able to get back into the fight into the fight. Bumblee in the first movie, if that happened to a human, it would be game over. Transformers are a hell of alot more hardier than we could ever imagine to be.
Puny humans assume since they looks mechanical or electronics, TF "aliens" must have same earthen properties as they use to know, and works the same way like the earthen machines. I believe even though they transform into earth-looking vehicles, they might look like one,felt like one, smell like one, but most probably its NOT the good 'old elements found in our "local" periodic table. From there, dont even bother to assume how their internal works.