They were going to get a backlash anyways since development of the entire game was just FUBAR'd so a non-gameplay trailer may as well be the only thing that was consistent ...
Eh, I'd rather get nothing than get some hype-ass CG trailer 3-4 years prior to release and that will only create false expectations for a game that'll be nothing like it. No, thanks.
The first episode will release before we even hear anything about Metroid Prime 4 gameplay.
Maybe. But that has nothing to do with how much or little content each game has, which, to be fair, was never the point of the thread.