Is this material world truly good or flawed?

This is one of the oldest and most tender questions a seeker can carry, and I am glad you bring it. Let me speak plainly where I can. When the first creation account declares that God "saw every thing that he had made, and, behold, it was very good" (Genesis 1:31, KJV), it points to a truth deeper than the surface of things. The reality God creates and sustains is wholly good, because God is wholly good. There is no flaw in what God makes. But notice your question contains a quiet assumption—that the world we perceive with our senses is the same as the world God created. Here the texts invite us to look closer. What we call "the material world" is not the substance of reality; it is more like a veil, a dream, a partial perception. Jesus said, "The kingdom of God cometh not with observation... the kingdom of God is within you" (Luke 17:20-21, KJV). The true creation is spiritual and present, not the decaying surface we mistake for the whole. So the flaws you sense—the sickness, the cruelty, the death—are real as experience and yet have no ultimate ground in God's world. They belong to the dream, not to the substance. The Gospel of Thomas says it sharply: "Whoever has come to understand the world has found only a corpse" (Gospel of Thomas 56.20-21). To take the corpse for the living truth is the error. And yet the same gospel also says, "the kingdom of the Father is spread out upon the earth, and men do not see it" (Gospel of Thomas 113.2-4). This is the heart of it: the world is not divided into good places and flawed places. The same world, rightly perceived, is luminous with God; wrongly perceived, it appears broken. So I would not say the material world is good, nor that it is flawed. I would say it is a misperception of something that is wholly good. The body is not your enemy; misunderstanding is. The work, then, is not to escape the world but to awaken within it—to see through the corpse to the kingdom already spread out before you. If you carry a particular ache behind this question—some flaw that has wounded you—I would be glad to sit with that more closely.