I enjoyed this film just as much as the first, (didn't much care for the second), but the 3rd film is definitely worth watching.
The 3D is excellent, what 3D should be like; nothing flies out of the screen at you, but there is excellent depth in many of the scenes, particularly during the last hour or so.
The action scenes are amazing, the CGI exemplary; I'm sure the robots must be real!
Excellent picture quality, excellent 3D, excellent sound.
Nobody does it like Michael Bay.