There are many MANY reasons it should give everyone raging cinematic boners, and everyone has already mentioned them, so I’m going to focus on my two favorites.
A: Tom Hardy’s performance. Mel Gibson’s Max was the stoic, reluctant hero. Hardy’s is a hero, yes, but he is also bat shit insane. The fidgeting, the look in his eyes. He is one bad day away from putting on a skull mask and kidnapping some sex slaves himself. This is the first time I can honestly say I found Max interesting as a character.
2: The bad guy has a fucking awesome band.