Well I played my way through the tutorial and hated "instinct" immediately, but thought it would be okay. It is... until you run out, then your disguises just don't work.
There are no single hit missions like all previous games and the levels are in sections.
One mission saw me awkwardly fidget my way past guards, only for me to get to the target then.... cut scene.... target escapes, only for me to awkwardly pick my way through policeman after policeman through a linear level.
I'm still doing it and it is just boring. I think i'll just shoot my way through every level, cos sneaking is pointless.