I'm sorry but this movie is terrible. Any writer who kills off main characters just to bring them back to life in the last 5%~ of the movie has no respect for the the intelligence of the audience. It is just shitty writing and shitty storytelling. Seriously? Death is just a minor inconvenience for protagonists; simply to delay the inevitable end? I know in storytelling it's common for the protagonists to have to overcome some major hurdle or obstacle before they can finish what they set out to accomplish, but death?
I know its a giant robot that could "technically" be rebuilt, but they left Jax dead in the first movie without rebuilding him, it is my assumption that 'Grasshopper Disassemble' means giant robots are fucked in this regard. They could have just as easily killed off a lesser good transformer, and left them dead. While not the shock impact of killing off a main protagonist, it would make up for it in the finality of what happened.
Que Futurama, "Oh no, Ziodberg ate Fry, Fry's dead! It's ok, I had another guy! YAY!" Only Futurama was funny, and it was an episode about video games being real life. 'Anthology of Interest 2'. X-men 3 did it, and you wonder why that movie was so absolutely shitty compared to the first two. Well X-men 3 was worse because at the end of the movie, it basically said, "Anything that happened in the movie didn't really matter."
Would a movie like 'Saving Private Ryan' been as powerful as a movie if any of those allied soldiers (especially Tom Hanks) just magicked back to life? Death is suppose to have an impact of finality, when you lost one of the allied men that was looking for Ryan you lost a part of yourself with it. When an old Ryan asks his wife, "Please tell me I've lead a good life, that I was a good man." You can feel in ONE sentence all the hope and fear of who he was as a person, and his internal conflict of if he was worth what one man sacrificed for another. This is only one example of good storytelling and a movie with special effects and explosions, it can be done.
But I guess I'm part of the minority who thought entertainment should contain a shred of value, based on the $200 million.
Edit: This is only one aspect with which I have issue, and have limited myself to just this one for the sake of brevity.