I'm almost done with Dark Souls 2, and I have to say that it's at least as good as Dark Souls (which is a solid 9.5). I'd probably say that it's like a 9.7.
The gameplay is a lot more balanced in DS2. Almost any build is fun and viable to use. The enemy AI is fantastic usually. It's a bit more accessible than DS, but it's by no means easier. The pacing is a little bit weird (lots of really small sections and really large sections) and bosses don't really get that much harder as you go along. Online is fantastic. Co-Op is fun as *Can'tSayThisOnTV*. The atmosphere is more "open" and seems more natural than DS. The story is a bit less dense than DS.
Overall, I'd highly recommend it to anyone who likes Dark Souls, action-adventure games like Legend of Zelda and the like, and a challenge.