I had seen all the average to negative reviews this game received, but I decided to try it anyway....and I think it's pretty good. Nice graphics, fun gameplay and an interesting story. It's also optimized extremely well. It kind of reminds me of Binary Domain, another underrated third person shooter.
Was it the boss that's standing above the lava, fires rockets at you, and after you damage him enough he leaves and you have to kill a group of Lutadores?And you have to repeat this process about four or fives times? If that's the boss you're referring to trying to beat him on even the Normal difficulty was like being dragged through the pits of Hell.
That boss fight was a ***** too. It's wasn't so much the waves of enemies or the strength of the Slave Drivers' attacks, it was the one-hit kill slaves with the explosives strapped to them. If they got any where near you you were dead.