Positive: - Enjoyable story - Graphics are pretty good for a sandbox game (but nowhere near the E3 level as it was advertised) - Cool concept - Solid multiplayer
Negative: - There is stutter even in a High end PC the game certainly needs a patch or two, gunplay is generic, car physics are a joke, most minigames such as ctOS towers and hacking are copy-pasted from other Ubisoft Montreal games - Missions are repetitive and most side missions are boring - Hacking is over-simplistic, Skill tree is useless and serves no purpose other than locking out features from you at the beginning of the game
The game isn't so bad and you can have some fun with it just don't expect anything groundbreaking. It was overhyped to the extreme by Ubisoft and people expected too much from it...