I agree that finale was a bit rushed, but anyway we got everything that we needed to get, I mean, we saw how Nya controls ice, how Kai's powers come back and how Zane becomes good again. Remember, they only had 11 minutes for the finale, not 22 like they used to have. And to my mind all these filler episodes were just for showing all (or almost all) abilities of new studio DHX media. You know, effects like anime and this "dark style" in Kaiju Protocol and also everything else were just for... um fun(?) Maybe they were really pointless and didn't have any special and important plot, but it was funny to watch such episodes. I also like this new style of animation, because it's a bit different from previous seasons. To my mind, it was really better (just my opinion) especially moments with using elemental powers. The only bad thing about finale, except of rushed plot, was the lack of angst and drama. That was the only thing that was missed and was bad for ending season in such way.
Anyway, I hope s12 will catch up everything. And now we only have to wait some time.