I was thinking about the movie Decepticons and I realized that I think that they aren´t weak, but rather incompetent. Why? Let´s take a look. They have the capabilities to infiltrate out society via vehicles and pretenders, here they have an extreme potential of seeding chaos (ok I´m ignoring the scans of the second movie, but I´m aiming at a RL invasion scenario). They also have showed the ability to disrupt communications and computers. Modern militaries are heavily dependent on communications and electronics. Imagine this: they could hack the USA military communications and shut it down, or they could hack the missiles silos and either detonate the nukes or launch them, like Skynet did. After that they would simply move in and kill whatever was left. I think Bay´s Decepticons are more incompetent than weak, since they have the mean and technology that if used in a good way, could bring Earth to it´s knees.