Leonard Nimoy made his second appearance voicing a cybertronian, (the first was Galvatron in the animated Transformer movie) as Vector Prime Nimoy added some gravitas to the plot and plays an interesting take on the judas type. Also Patrick Dempsy made a decent villain with an uniquely deep concept. It's not shaespeare but for a movie that was based on a toyline and that got maybe 15% of the lore from the cartoon correct, it wasn't bad.
regardless I still hate the way they butchered Bumblebee it's a perfect example of what was wrong with Bay's "vision". Bumblebee was a VW beetle, because he was meant to be a link between humans and autobots. He carried no guns, and had was quite talkative. Instead we get a muscle car who talks by suing the radio, I know Volswagon apparently have taken issue with thier car being used to hock "war toys" but he could have just as easily been a Mini Cooper, PT Cruiser or a Fiat. but no, let's make him a mustang! That makes sense! And he can pee on John Totouro! I mean how hard would it be to make a good movie, the cartoon did a better job with a shoestring budget than bay did with Spielburg backing him and an unlimited amount of 'Splosions! O.K. Rant over.
I give this move one and a half star for it's watchability which is 5 stars more than I would give either of the previous films.