I wish they wouldn't use big name celebs all the time for voice acting. They did an okay job, but if you watch the OG Transformers Movie the diversity of voices is so much better. Many times throughout the movie I heard Thor speaking when Pax was speaking. The animation was clean, and looked good, but the action scenes were a bit hard to follow at times. I'm also disappointed by how they inserted a bit too many comedic bits throughout the movie, especially during tense high-stake fights, it just felt off and often undercut the seriousness of some scenes. I also think this should have been two movies, D16 turning insane evil just felt off, there didn't really seem to be an underlying reason for him to betray Pax. He was just like muh ha ha ha I'm insane now! They could have done a better job developing the character and fleshing out his arc.
All that said, I did enjoy the movie for what it was. I think it's perhaps more geared towards children to sell toys, and as an adult who grew up with Transformers I know they can do better with the franchise. But, if you have some young kids, they'll enjoy the heck out of it.