Riverstone is a bit out of the way but has the second largest screen in Georgia with stadium seating and THX sound. (The largest is in Savannah.) The large theatre seats 600! It is worth the drive to see a first run blockbuster on opening week. I saw both recent Star Wars there and it was awsome. The experience just engulfs you. Drive North on I-575 to the Riverstone/Canton exit (think it is 21 or 22). Left off the highway and is about a mile down on the right.
Pros: Stadium Seating, THX, Largest Screen in GA
Cons: Out of Way