Modern day general purpose plywood is pretty awful. Most have big thick lamination with very thin skins to try to make it look nice. It won't bend right and like was said tends to be full of openings inside that don't take bends well.

I too have made down and dirty boats that held up pretty well in A/C plywood but you spend an awful lot of time finishing the boat to make it look decent that you have to wonder how much your time is worth.

Bill H.