Kefka isn't godlike though. He's a nincompoop. A nitwit. A ninny. And various other words starting with n that convey nitwit-ninnyness
what makes VI good is the protagonists, their struggles and their growth. Kefka's stagnating stupidity shows what evil truly is: It can go deep, but ultimately compared to good it is shallow and one sided. It wants destruction only: to quote Neo-Ex-Death from V, "and then I [ evil ] will destroy myself"