'Toona was called the "Dead Sea" for a long, long time. Rock and clay rendered the lake pretty infertile, and when you couple that with extremely heavy fishing pressure (lake is on the northwest side of Atlanta), what you are left with is tough fishing.
But you don't hear people slandering it like that much anymore. Allatoona is on a major upswing, and fishing is good. Not great, but good --you're lucky to break 12 lbs in bass on this lake (for 5 fish), but on good days you can catch high numbers.
Allatoona has striper, spots, largemouth,...the usual mix. One of the things they are known for is their hybrids. There are billions of them in Allatoona. There aren't many over 3lbs, but you can catch a mess of them.