Just got back and I really liked it. The story was much better than the one from TF2, as was the acting. Plenty of humor in the first half without it being as goofy as the Twins from TF2.
I would have liked a little better introduction to some of the new robots and I got some of the Decepticons, especially, mixed up because they seemed to look too much alike.
I liked Turturro's Simmons better in this movie than the last two. Thought Dempsey played a good character and was surprised by Huntington-Whiteley. She did a good job and I honestly didn't miss Megan Fox or the Mikaela character.
The way they ended it it would be hard to do a 4th, I think, but I liked this much better than TF2 and would spend the cash to see a 4th film.