I'm about to impulse by this because I'm on break these next two weeks and am looking for a serious time sink. I loved the last SimCity and always seem to get lost in the complexities of city building.
I really don't know much about the game aside from what I've seen in trailers. I don't give a shit about always online, and prefer to play by myself. Will I be a happy camper?
You'll be happy. You can choose to play by yourself or select friends or strangers, sandbox or leaderboard. All up to you. You can do a single city in a 3-city region, or control all 16 cities in a 16-city region yourself.