DMC 4 is one of the greatest action games I've seen on the PC and it won't repeat until after a very very long time...
The tutorial system starts teaching you the tricks from the very basic to the very advanced levels. The action is variable and it is up to you how to fill the action bar at the top of the screen.
Nero is a great improvement over the series. at first when I played with him I was hesitant to go back to playing to Dante (At a certain level in the game you have to switch characters). But then again, when I played with Dante I didn't want to go back to Nero! Dante is faster and stronger in this installation of the series and that makes the action bar CRAZY!
I really loved everything about this game and I won't complain about the lack of new content since the only DMC I played before lacked the standard quality for me to enjoy its features. now all those features are packed into a fantastic game and I can enjoy them with the rest of the new content.
Have fun playing this game.