1 - 50 - God of war 3
2 - 40 - God of war 2
3 - 30 - God of war 1
4 - 20 - God of war ascension
5 - 10 - God of War: Ghost of Sparta
apparently i dont' play this genre much outside of god of war.
i didnt like what i played of bayonetta. mad world was trash. heavenly sword was okay but not getting my vote. i'd vote for demon's souls/dark souls/bloodborne but i don't think they are hack and slash. going down the list i haven't played anything else on it.
That's good, as you've played the best hack and slash franchise xD
But you should try out Metal Gear Rising, as its very different from the rest and entertaining.