The Witcher series

And the ability to eliminate all the opposition.

No boss. There could large beasts/monsters as regular mini-bosses, but having one head boss ruins the flow/realism of a game. In a good story the palate shouldn't be black and white, but rather various shades of grey.

I'd like to see them handle a feral snake. All those snakes are domesticated.

Flamethrower is the way to play it! I just wish the napalm tank lasted longer!