It's funny, because in a way you're right, there are less individual unique powers, but I find it so much more satisfying and so much more faithful to the comic. In the first game sure you could use your crawling snake or black holes etc, but it was so fiddly you could only ever use one thing at a time, then hide in the darkness again to recharge. In this one you can do everything at once, string awesome attacks together. Send out a swarm of darkness, snatch a hostage, rip his spine out through his but, use that force to form a darkness shield, use darkness guns over the shield to mow down 5 guys, throw the shield at another guy then throw your darkling at the last guy. It's so much more satisfying to clear out a room. In the first game it was very a much a 'kill one guy at a time' type thing, in this one, you feel like this immensely powerful force that could just tear through armies with ease.
I also think they made the Light Weakness much better in this game. Instead of being paranoid over whether you're losing power, it's a much more simple 'In the light, no darkness powers. In the dark, full darkness powers'. It means you have to react much quicker to any enemies with flash grenades or shoulder lights.
I'll definitely be up for any co-op if anyone is keen once they've finished single player.