In any instance, let me break this down into the two main parts this DLC adds to the game. The story and the new features.
As far as the story goes, this whole DLC is about Dante trying to catch up to the man that killed Beatrice and, from character model, himself. All by not trying to get lost in the Dark Forest that the assassin seemingly knows all the secrets about. Which is weird to me, but I guess it was needed to make the DLC a bit more intriguing. Although you do find out along the way that Beatrice had planned to send Virgil to you the whole time to help you along your journey into Hell. Even though at this point in the story Dante had no clue about her death or that he would be going to Hell.
For the new features, this is also kind of a let down much like the story. Well outside of the Disco Inferno costume for Dante. The other "new" features consisted of what looked like old character models with new textures over them. The Forest Siren as it is deem is quite literally a "fatter", more clothed version of the Lust Demon. Same attacks and effects, just without the vagina exploding out. She can entrance Dante with "singing" even though she does the same motions as the Lust Demon with it's entrancement. Oh, and she uses claws. Like I said, old model, new texture. I thought Square-Enix was the pioneer in re-coloring monsters and packaging them as new.
To wrap it all up here, if this DLC didn't come packaged with the game in the first place, I would have been very upset in it's purchase. There was really nothing new, except for the trophies/achievements and the little bit of the story. Which technically was already given to you if you played the game to the end already. On top of that, none of the extra story makes sense in the overall scheme of things. I mean, Dante had the items and powers that he didn't even know he would have at this point in the story. Hell he didn't even know Beatrice was dead, but was so accepting of her ghost telling him what is what.
Let's hope the next batch of DLC adds more than this little freebie.
Dante's Inferno: Dark Forest was developed and published by Visceral Games and EA for the XBox 360 and PlayStation 3 on March 2nd. Requires a copy of Dante's Inferno. Dark Forest comes packaged with Dante's Inferno. I played through the new content in about a half hour.