For me it was Shank on PC. I expect on Hard it's a much better gaming experience, but I found "Grab and Chainsaw" a tactic that got me through 80% of the game. Boss fights were not so interesting, it was a question of working out what the "trick" was to activate the death blows, only two of the last 4 were really a challenge, one (Angelo if memory serves) because the death blow wasn't an auto achieve, but you actually had to fight the boss for (knock back into fire). and another because it was an endless enemy swarm, which are generally the hardest part of the game, doubly so if they include the dog enemies.