Oh, firepower was great, but her handling made the F4U look gentle by comparison. Dauntless was actually tougher, more maneuverable, more stable in a dive (what's the point of twice the bombload if it's harder to keep on target?) and FAR easier and more forgiving to fly. And from every account I've ever read, Navy squadrons equipped with the SB2C hated them and would have preferred to have their Dauntlesses back, and Marine squadrons all but refused them.
They didn't call the Helldiver "Son of a B----, 2nd Class" for nothing.