It makes me so happy to see Spartan: Total Warrior appear in a couple of posts here. That is one of my favorite games in this genre. Great weapons, the combat was better (it was more a strategic, boxing-like, back and forth with each enemy), and the HUGE battles were awesome (hundreds of allies and enemies all killing each other independently, in real time).
Seriously, if you like God of War, check out Spartan: Total Warrior. It rocks, but be warned, it can KICK YOUR ASS. It's about 10x harder.
On Topic: Why is God of War the paragon of the "Spectacle Brawler"? Is it because it's better? Maybe. I would argue that Spartan is better though.
No the truth is that it's because of the game's massive popularity (sales figures), unanimous critical praise, easy accessibility to the casual-core crowd (halo/madden-ites) (the game is pretty easy), and familiar setting. Almost every other game mentioned in this thread lacks some component of this list.
Afterall, history is written by the victors. And when it comes to popularity, God of War is the victor of the 3rd person brawler.