I would love to play a modern SimCity in my browser. It would be awesome to build my city and share it with my friends so they can see my progress. It would be cool to have them do stuff in my city if they want that isn't annoying. It would be great to be able to play the whole game and not be stopped to enter my credit card every 15 minutes. It would be great if I could drop in and play for 15 minutes or 5 hours if I wanted.
I guess in the end SimCity Social is just too similar to other games I have left to be compelling to me. That said, its free on Facebook and you should check it out for yourself if you are interested.
You can do that by here: