It's been several years since I've been to AC, but I think the best buffet is at Bally's Wild West casino. Lots of variety, most items are decent quality, but it does get very crowded.
We always enjoy Harrah's Waterfront Buffet if we decide to go that way..... they have different stations for things like grilled Steak, grilled Salmon, Latin food, Pasta, Sushi,etc, etc, so you can pick & choose many things....enjoy !