Okay, so I have taken a quick look at the logs and his armory.
To start off, he really has to optimize his gear a hell lot better.
No wonder he is doing really bad damage as fury warrior, having so little mastery.
His ONLY source for mastery are his weapons, which is a BIG NO go, as mastery is ranked SECOND most important (after crit) for fury.
Also, he is making (in my eyes) some wrong spec chooses for certain bosses.
Hans'gar -> he should go arms!
Flamebender -> he should go arms!
It's hard to judge someone simply by looking at the logs.
For example, he might just be using abilities without being enraged (big mistake).
But it his gear could also be a really big problem.
Not sure how other people would think about this statement (about his gear being really bad for fury).
His armory:
http://us.battle.net/wow/en/characte...Malal/advanced