1,4,3,2
when i played the first one i thought it was the coolest game, 2 was o.k and 3 was just not as interesing to me except for vergil
4 surprised me with its great graphics,story, best cut scenes in gaming and and constant action/ platforming gameplay thanks to nero and his devil bringer,
but just for originality and it fond place in my heart( easily one of my 10 favorite games) i would have to say 1