I've never liked the backgrounds in this series. They always look a bit wrong. But reading this issue I wonder if it's more a lack of the characters filling the spaces well. Everyone's generally got a slim humanoid frame rather than a robot body. And the bodies are all the same height. Maybe those Triggerbots got an upgrade? Things like Grimlock's back kibble and Starscream wings are really small too. The robot don't seem to fill the frame they way they should. And what was with the literal key being turned on Perceptor's chest to make him "evil". That was just a bit too silly.
The Earth stuff, the lets go into the sewers stuff, all just had me wondering "why?". Optimus retiring on Earth to help a few human survivors who don't want his help? Galvatron pops up now of all times? And why did the reformatted Cybertron retain "badlands", "demons" and secret sewers?
It would have been a lot more interesting if the Autobot Headmasters were on Scorponok's side not because they were "turned evil" but because they wanted to be. They were left behind as heads for two decades (in jars like Futurama?!). Plenty of time there to sour on the Autobot cause.
Or the story thread I would have gone with: these three Headmasters literally have no soul. Their sparks were in their bodies (and we're reminded in Perceptor's analysis of Grimlock [if it hasn't come up before] that the Marvelverse bots now have Sparks) and those are extinguished/part of the Matrix. All that's left is their minds and perhaps a Transformer with no spark loses good emotions like compassion.
One good thing about All Hail Megatron, was the take it took with the Headmaster process, that it violated Sunstreaker so much he wanted revenge on the whole planet Earth. Sure it undid the good working relationship between Sunstreaker and Hunter from Maximum Dinobots, but it made more sense then "oh and now Brainstorm is evil".
Or what the hell, why not just use the cartoon's hate plague to make all the Autobots bad and mad. Colour everyone red so it really feels like a G1 Marvel comic!
I agree with I_amtrunks completely, this series doesn't hold it's weight against MTMTE/RID.