The beginning scene where he demolishes the Qatar base is one of the best scenes imo. He was extremely beastly.
I would have liked it more if he would have stepped on Josh Duhamel. THen wiped his foot off.
Was Blackout in G1? The old cartoon? I don't remember him.
EDIT:Nevermind.
He needed more personality, notwithstanding he was one of the better-designed Transformers.
His bio in the "official Transformers movie book" actually says that he's a coward at heart, and chooses to attack from afar or sneak up as opposed to attacking someone head-on.