Everyone says it's something new (playing as Raiden and cutting everything), but you guys, there already was a chance (and still is) to experience how is it like to play as Raiden with a blade, and I don't mean the old MGS2, I mean MGO wth Scene Expansion in MGS4. And I always loved playing as him in MGO! Slicing the crap out of everyone and defending from the bullets! Awesome!
And Rising just gave many improvments to Raiden including new tricks etc + better graphics. And btw, what's really best in MGS games: the storyline!