That article is hilarious!
"Most fans agree that one must either ignore it or accept it, lest they be tempted to explain these problems and in the process fanwank themselves into oblivion."
TFwiki entry is nearly the same, but the fact that the word 'fanwank' links to another article is even funnier!
I hope you knew the size of the Datsuns before you got them, otherwise it'd be a rude shock! I agree that the scale is so often problematic, and article linked above says plenty about it. On the other hand, scaling a car to a plane is a handful in itself... getting it nearly right would be ROTF Leader Starscream vs Deluxe Bumblebee, and even then, the plane should be bigger. The movie tried to be accurate in some scenes, and then in others we have truck Optimus drop kicking F-22 Starscream. It's never gonna be perfect...
Anyway, in answer to your question... MP Starscream is not as big as MP-01 or MP-05 molds, but is close to MP-10 Prime mold. I'm at work so don't have them at hand to compare, but I believe MP-10 is a bit taller than Starscream. The original MP-01 & MP-05 arguably doesn't scale well with any of the later release MP figures, and it appears the intention is to scale them with MP-10.