Go see “Transformers”
This is a fantastic movie for men age 13 to 50. Women will probably find it ok. Cool cars, hot women, guns, planes, trucks, explosions, monster robots, I can't figure out why I was so sure this movie would flop. There are plot devises, like a secret map etched into old glasses, which might have been used to make the movie more suspenseful and dynamic but the editors made the call to minimize such things to keep the fast, adventure pacing.
What about the “PG-13” Rating?
There are several strong innuendos and it would be tempting to judge a couple scenes of Megan Fox looking hot in tight clothes as pure objectification but for two things. First is that the perspective is clearly not between us and the actress, but between an unpopular teen boy and a popular teen girl. The flirtation, etc. makes sense in context. The second factor is the conversation they have about being superficial and seeing deeper into who she is. It's very redeeming.
The larger story
This is a movie about honor and sacrifice. See if this sounds familiar there's a war between good and evil somewhere in the stars and the great evil comes to earth seeking power, and the hero of the good guys comes to save the day even if it means giving his life.
What this movie shows, that many films don't, is the role humans play in all this, and the care and concern these powerful beings have for them. It's a very inspiring thing.