Some thoughts on Splinter Cell: Blacklist so far...
It really is awesome, haha. I've been playing it more in the past couple weeks since doing the co-op missions with CAD and it's been really enjoyable. You can choose your own playstyle throughout the whole game and you will still be rewarded for that, whether it be complete stealth and no killing, stealth with lethal kills or jumping in with all guns blazing or a mix of everything; it's all up to you. There are heaps of customisation and upgrades you can play around with for Sam Fisher as well as new gadgets and weapons to purchase to suit your playstyle.
Gameplay-wise, it feels like a mix between Hitman: Absolution (stealth/sneaking) and Uncharted (platforming) for me. Splinter Cell: Blacklist does encourage stealth since there will be reinforcements and things like that if you set off any alarms or get caught. But there are also a lot of paths and choices you can make about how to complete your objective or get to a certain destination so it doesn't feel as linear. I like how we can shoot the lights to make it harder for the guards to see us.
I'm finding that I still take close to an hour to complete each campaign mission haha, mostly because I like playing with non-lethal stealth and knocking out all the enemies along the way. And I'm only playing on normal difficulty, which is fairly easy.
The co-op is really well done too

. For some reason I can't join CAD when he hosts, but he can join me so that's all good. There's a lot of variety in the missions too and some of them require lots of retries (especially the complete stealth ones) to get it right, hehe. I have't tried the Spy vs Mercs multiplayer yet though.