While its not perfect, DOA4 is a fun fighting game, that will occupy a lot of your time.
The DOA series has never been entirely deep, and while DOA4 doesn't add a lot to the series, its still a very fun game, and worth a look if your a fan of fighting games.
The story of DOA4 is to be debated, to be honest, i can't decipher it, there's something to do with an evil organization, and ninja's, but at other times it seems to be about mermaids and making salad, so I really don't know what to say about it, other than that the story isn't really the focus, its boobs, in all reality, that's what the focus seems to be.
Boobs aside, lets go into the game play, now as i said, DOA has never really been a deep fighting series, and it still remains fairly simple, although they tweaked it a bit, you still make use of four main buttons, a punch, kick, throw, and guard/counter button, as you did in previous games, the only difference is that they fixed the counter system so its not as easy to counter your opponent. They've added three new characters to the roster, and a bunch of new stages as well.
Graphics are ascetically pleasing, most notably the backgrounds, which look downright amazing, character models look good as well, but not nearly as good as the backgrounds.
The sound on a whole tends to be good, the Japanese voice over is done quite nicely, and the sound tracks fit the game nicely.
Overall, i had a lot of fun with DOA4, and I think anyone who has a 360, and is a fan of fighting games should give the game a look, I'm going to give DOA4 a 8.7/10.