I hate the size. Not so much that he's bad in and of himself, or that he will look bad with select bots. It's that this is going to set off a whole chain reaction with other characters. Undoubtedly, Megatron and Galvatron will be at this new height. And then new toys will have to be scaled against either the old scale or this new one. The Dinobots were mentioned already. What about the Seekers? They aren't supposed to be much shorter than Megatron. Etc.
Coming after Magnus, Omega Prime, SS86 Springer being taller, etc., I'm betting the end result of this is going to be a slow march back toward the pre-WfC sorta-in-scale approach. As someone who has absolutely loved the WfC-to-present era especially for its robot mode scaling, that's saddening.
Worst of all? I hate that I'm probably going to end up buying him anyway. I'm sure I'll be getting the new Megs and Galvy unless they completely drop the ball on those. Then definitely Rodimus whenever they get around to an SS86 version. Having ER Optimus as a shrimp among that group would bug me endlessly.
*Goes to look for some clouds to yell at.*