Think of it as God of War, except that we can have it on PC :)
Now the fun starts, well the cinematic didn't had any sound don't know why but i ignored that, started with falling from the sky into a very unfortunate soldier and here the massacre starts. The game is very gory, very brutal, cruel. I was thinking it was too much but then i remembered the game God of War, very similar except NO weapons, full and fast regeneration, rage powered fury attacks, and .... well Wolverine so the Adamantite Claws are the actual arsenal. Graphics Aldo were not at maxim it was still cool compared to GoW, there you see how he smashes someone into a stone lots of blood and still see his face its a bit silly but here you see the very skull, ribs, skeleton, muscle,for more realism. But the enemy is not spared by decapitation, loosing limbs.
The difficulty, well "Very easy" like you can run, dodge for a wile and have you're health back up in no time, and you get the Feral sense wich is a major advantage, seeing traps, puzzle items, buttons, switches, doors enemy's like the Ghosts( no there just military guys with cloak generator) even a blue trail that shows up to give a hand.
Story im sorry but i can't say much cos the cinematic's didn't work for me so i can't tell about it, plus i don't want to be spoiler, just that its very different from the movie.
Boss fights are repetitive and at the beginning its just Lunge and press attack like a retard, but then the Fury attacks make it more fun. And you got good variety of enemy's, and if you kill many of them you increase the "reflexes" which increases damage dealt to that class, including mini bosses.
So like i said with the reflexes, you can develop Wolverine from Weapon X to Chuck Norris( not rely but still very powerful anyway :P ) The skills which you get from leveling to upgrade Fury attacks and stats like Claw Damage, Health, and Rage. Then we have the Mutagens which are mini upgrades that you can change any time and get to up to 3 levels.
*takes a breath* ok so all in all a cool game, if you look for a good hack and slash you won't bee disappointed, if you're a Wolverine fan i must tell you he's completely different from the movie, but if you're looking for the Brute within Wolverine you'll get it.