Overall, I thought the movie was a B- or C+. I love the Transformer franchise. The plot was (like the last 2) irrelevant to anything. The visuals were stunning. I saw it in 3D, which I thought was on it's way out, but 3D MADE this movie good. The acting was poor to bad. Action scenes were more blocky than in any of the previous movies. The "remaining" autobots had very little dialog and BumbleBee was almost none existent in this movie. They tried to give him the same connection with the new characters without any history. Did I mention how outstanding the visuals and 3D were.
While this movie is just more Michael Bay trash, you know what you are getting if you go. While long, it makes the price per minute seem "better.
Go if you like the franchise.