Great but too long... Watch at your own risk
Personally, i felt that the 'revenge of the fallen' was somewhat better than the 3rd installment. It had some great fight scenes right from the starting 10-mins.
The chick Rosie-hunlington Whiteley was watchable, but was not at all as sexy compared to Megan Fox. Shia did a great job. Optimus is the one to watch out for. BTW Bumble Bee had a lot of Fights this time around.
You'll get to see another Living Prime-- Sentinal Prime-- this time, he is most suited to be the villain. The CGI is best used in this movie.
You'll get to see Transformers with Mustaches and other odd stuff. Bit still it is great film to watch.