I'm still a bit in two minds about this one so far.
It has potential, with Hopkins, historical flashback scenes, and the return of Lennox... but past experience has shown that Bay has a one-track vision for each scene so that they aren't easily stitched together into a movie... spoiling consistency or coherency, especially in the characters, both robot and human (big names like Malkovic, and returning characters like Epps).
I guess we just have to wait and see if the "writers room" of mapping out the future of Transformers, makes any difference on the individual movie, and the short-sighted "scene by scene" vision of Michael Bay.