If your connection is less than stellar, or you're using a VPN, the game offers you the same experience as it offers to pirates. That is, you'll be forced to play in offline mode for reliable gameplay in a single player game, and you wont be able to access tabs and tabs of options. You won't even get a rating at the end of a mission, or be able to get unlocks. Not that I'm advocating that you should pirate. The devs of this game did a great job. The publisher, on another hand, needs a straitjacket.
The worse IA of all hitman
Copy and pasted animations of all NPC
Always online for a SINGLE PLAYER GAME
Crappy contracts mode
No weapon customization
No money system
Horrible gun physics
No human shield
All unlockable weapons and stuffs are in online-mode only, so if you want to start this baby up a few years from now like one does with Blood Money, you most likely won't have access to it or probably most of the game.