I believe Gustav was barely a Cat3 when it first started making landfall, but quickly degraded to a Cat2. Now it's just a Tropical Storm. Hanna probably won't be very strong because Gustav's outflow boundary was keeping Hanna from developing and strengthening. As soon as Gustav weakened from landfall, Hanna quickly became a Cat1 hurricane. Hanna has the ability to strengthen to a Cat2/Cat3 before she makes landfall in the Carolinas. Ike still has a lot of open water to cross. It's too early to say just how strong that storm will be by the time it gets to the Caribbean...