A good mix of action, adventure, and a new playable character make DMC 4 a game that fans of the series shouldn't miss.
Gameplay wise, DMC 4 has all of the traditional action and fighting that veterans of the series will recognize instantly. It also features a great deal of adventure and even some puzzles that may throw some players for a loop during the course of the game. The action is fast-paced, the fighting is challenging but fair, and the differences in fighting styles between the two characters will help to keep players interested. Otherwise, the game proveides all of the run-n-gunnin, sword-swinging action that any player could ask for.
Overall, I give this game a 9.0. The controls are excellent, the graphics are superb and the gameplay is first-rate. The only reasons I cannot give it a "10" is because of a puzzle in the last half of the game that players could spend hours on (without the advice of a guide) and the fact that the replay value is not as high as with other action games I've played. Aside from that, DMC 4 is an outstanding game that provides plenty of action, some great boss fights (especially an absolutely HUGE statue near the end of the game), adventure, and the ability to upgrade your character as you see fit. I highly recommend it.