Despite the cartoon and B&R, Bane's the exact opposite of a hired muscle.
He's the "Anti-Batman." He came to Gotham because he spent his entire life n a prison and the fear of Batman makes Gotham into a prison city. He deduces that Batman is Bruce Wayne extremely quickly and develops a plan to take him out. He destroys Arkham's walls releasing all the most dangerous of criminals in Gotham forcing Batman to catch them. With Batman exhausted, Bane ambushes him in the Batcave and breaks his back, taking him out, and allowing Bane to take over the criminal underworld.
Mastermind wise he's more brilliant than Ra's in Begins. He pretty much did the same thing Ra's did, without the help of a ancient organization devoted to bringing down cities.
Also, if you're curious. Here's Unmasked, Non-Ridiculously huge Bane.