I felt the found footage was pretty great idea for this movie, since most of it is from Andrew's camera which allows the audience to experience everything through his perspective. Also, i think it was good that they did not limit it to just his perspective/camera, and it jumped at times to other cameras/perspective of other characters.
During the film, I definitely perceived Andrew as resonating a Magneto type quality in his character. Growing up hurt, distraught, and abused, i found it quite obvious that he would eventually misuse his powers. Unable to control his suppressed emotions, Andrew now has a way to release and retaliate which inevitably leads him to rampage.
There was only one real qualm i had with the film. Why did they have to go cliche and kill off the black guy? I mean come on, I was expecting better than that from this film, so i totally didn't see Steve actually being killed off. Now in retrospect, the filmmaker probably wasn't concerned with the race of the character who dies and i'm probably just erroneously fixating on a movie stereotype. The sole main black character's death didn't jolt me into a state of boycotting the moving or anything crazy like that, it really just made me say aloud "what? really? the black guy dies? oh come on!" and then i went on enjoying the movie. During the beginning of the funeral scene i thought it might have been a tease and some other character may have died instead, and Steve would have just been injured by Andrew's raging. At a point near the end i thought maybe Steve would return, maybe due to the powers having some regenerative capabilities or something.
When i first saw the trailer, it was fairly easy to suspect Andrew would turn dangerous. Hence why i expected the two other characters to team up and fight against the stronger darker power in the end. I certainly wasn't disappointed that the film didn't end they way i guessed. Overall i enjoyed the ending, the entire movie really was pretty awesome to be clear. Much like after watching Drive and immediately wanting to strap my watch to my steering wheel, blare some chill ambient music and just drive; Chronicle sparked a desire to take up spelunking in search of some buried cosmic power.
I actually hope there is a sequel to this, as long as they do it at least as well as this one, with or without (probably better w/o) found footage style. I could totally see it as an origin story for a new comic superhero.