I quite like how Ben Yee's review points out the merits of the film without having to resorting to the "switch off your brain" or "lower your standards" argument. It points out the merits of the story for what they are and allows them to stand on their own, and is a better way of supporting the strengths of the film IMHO.
I agree, but I suppose that they didn't want to confuse audience members with two different terms for the same thing. To AoE's credit, we never hear any of the Transformers refer to Cybertronium as "Transformium." Optimus Prime refers to it as something like, "our basic metals."
And it's arguably typical for humans to just name things for what they think it should be called rather than what it should be actually called. e.g. the didgeridoo. The Manggalili word for it as "yidaki." The word 'didgeridoo' is derived from 'dijeridu' which is merely the onomatopoeia for the sound that the instrument makes. So the idea of the English language referring to the Yidaki as a "Didgeridoo" is akin to referring to say a piano as a "Do-re-mi-fa-so-la-ti-do."
Even if he only acquired the ability after "Knight Up!", there were still a few moments where I wonder why he didn't use that ability, such as flying back to Hong Kong or trying to control his ascent towards Lockdown's ship. Or heck, just flying out of the Collection ship... something to visually tell the audience that he has this new ability now.
Revenge of the Fallen did the same thing, really. But it showed how. Jetfire sacrificed himself, Ratchet and Jolt combined his parts with Optimus Prime, and I still get a big buzz when I hear Optimus Prime go, "Let's roll!" before flying off to lay Smack Down(TM) on The Fallen!