Soldato
Also going on what davida76 said, i'd say not much. I think this game is very much 'what you make it'. So using drones and using tactics to try to not get detected are where the fun is but not necessary. I think I'll ramp up the difficulty and see if that helps.
Yea, the stealth aspect is fun but splinter cell has that covered. I think it's very much focused on online squad play. Hopefully the new one is a bit more structured for solo play and more proper mission focused rather than a vast map full of gather-able items.