Hayden was actually pretty good in Shattered Glass, but he just can't pull off anything dramatically, especially in key scenes in a movie. He is so bad in the PT, especially in ROTS when he is arguing with Obiwan on Mustafar, that scene is laughable.
Hayden is an example of what is wrong with Hollywood these days, as there are many actors/actresses who are employed and get movie roles simply because they are good looking people. There are alot of good actors these days who don't have movie star looks (Phillip Seymour Hoffman, Ed Norton, and I'm sure we can make a nice list). But the big budget movie roles go to the 'good looking' actors who can't act for shit like the guy in Indy IV and Transformers, can't think of his name, but he sucks. Megan Fox is another example of a hot actress who gets a job simply because she is hot.
If you want to see early Hayden, rent the TV series Higher Ground, where he plays a troubled teen who is sent to a reform school. He does the same exact whiney crap in that show, and is just as bad as he was in the PT.