Necessary suffering that makes you grow is good, but unnecessary suffering that doesn't seem to have a point is not. Therefore creation cannot be naturally good because it has too much unnecessary suffering.
Take Candace Newmaker for example, there is literally no point in her dying a horrible death suffocating in her own vomit. Whatever God's plan if he exist and is wholly good might be, it does not justify making a girl suffer like that. It does not justify what happened to Junko Furuta. It does not justify the many children that are born just to suffer in African countries, nor does it justify a lot of unnecessary suffering in the world.
The fact that we value reality does not make reality inherently good, it means merely that we perceive reality as inherently good. That perception is wrong, reality is not inherently good. Good and evil to begin with, are just creations of our perception. Reality cannot be called inherently good or evil. Good for whom? For you? For Junko Furuta? For your neighbour? Life might be good for you, but an absolute hell for someone else, both of those constitute reality.
There is no good and evil in reality. Reality simply is, it is in itself a collection of different perceptions that make it up, which cannot be judged in such simple terms as good or evil. The most we can do is to make the best out of it we can, and love it no matter how it is. Because the one thing that is true about reality, is that its inescapable. You cannot cut yourself off from it and the pain that it brings with you. So you have to deal with it, to love even the most horrendous moments of your existence. You have to go constantly forwards saying "Yes" to the world. You will never reach this ideal completely, but there must be a point in your life where you look back at everything that has happened and you tell yourself "From all the things that have happened to me, I would not change even a slightest detail, I would go through it all again, if it meant just to live and to appreciate the things I have gotten".