Regarding the whole scale thing, I think the Fwoosh review said it best...
"The last big discussion point I want to hit is the scale of these two figures. There has been a loud outcry that these two figures are too small in comparison to the turtles, and while I would have preferred that they were a bit taller, I think we, as a collective fan base, have brought that perception on ourselves. The old action figures and cartoon, which are undoubtably the most famous renderings of Bebop and Rocksteady, don’t feature giant versions of them. In fact, I am not sure where we got that from because I cannot find any source material (at least well-known) where they are big.
If you look at the vintage figures, Bebop and Rocksteady are pretty much exactly the same height as the turtles. Sure, they all had bent knees, but they were very close nonetheless. The same is true about the cartoon because if you go back and watch (I did), they are also very close in height. So, while I would have preferred that they were bigger, I cannot really fault Playmates with the scale because they are actually consistent with their vintage counterparts and influences."
I agree 110% with this. I too re-watched the cartoon, and yeah, they are essentially the same size. I too believe it's just a self-made perception in the vein of "they're bad guys" or maybe even because the real life counter parts are pretty large animals? Either way, I think they're awesome figures and I'm happy that they were made.