I've played the beginning at a friend's home (up to the first cTOS hack).
I felt a little without help, I was thrown in the game and I didn't had time to get used to the controller or time to explore the environment (you start with the need to escape so you don't have time to look around, you just run randomly).
I also played it on Xbox360 while I'm used to play Nintendo's console, so the controller was a little backward for me. When they said "Press A" I pressed B etc. That's partly why it was difficult for me to get used to the control.
Then when I had to enter a restricted area, I lost 10-15 times until I found what to do and where to go, which path to secure etc.
You fail the mission very often, and you restart it from the beginning each time, which becomes frustrating as it's too much repetitive
There's a lot of cameras but it seems they never detects you, it's always for your own use. a little weird for surveillance cameras to not detect intrusions in restricted areas
I think it could be a good game if I take the time to understand the environment and all the menus/actions.
I'll wait for the WiiU version to see what they plan to do with the gamepad. (I hope it's not just the city map, or offTV play)