Ananda,
Suffering, pain, and illness are not more fundamental than joy, pleasure, or health. There is a fundamental question that hasn't really been examined here is and that is, what is suffering? what is pain? What is illness?
If you dig into this question you will find at the bottom that suffering, pain, and illness are all states of loss. The experience of loss, by definition, cannot be prior to, or more fundamental than that which is lost.
Suffering is essentially the loss of joy or pleasure. In a certain sense Buddha was correct that suffering is caused by desire because we all desire joy and pleasure. The suffering that we experience is when that desire is unfulfilled. All suffering, in this sense, is the result of unfulfilled desire, which is an experience of loss.
Pain and Illness are just two specific examples of this principle. Illness is the loss of health, pain is the loss of pleasure. Health is a pleasurable state. We often don't realize this because it is, in fact, our natural, fundamental state. We only realize how pleasurable health really is when we lose it and experience illness.
The east and the west have offered two different, indeed almost opposite, paths to dealing with this problem of suffering. They both recognize that suffering is the result of unfulfilled desire for pleasure or enjoyment. The only way, thus, to remove suffering, is to create a situation in which the level of desire matches the level of fulfillment/enjoyment. The east attempts answers this problem by teaching denial of desire. This balances the equation, as it were, by lowering desire. The west, on the other hand, attempts to answer the problem by raising the level of pleasure and enjoyment. It tries to meet all desires, thus balancing the equation by raising fulfillment of desire.
Christianity offers a fundamentally different path than either east or west. Christianity teaches first that there is a right order to desires and we must keep them in that order. This provides a surface similarity to Buddhism. However, the core of Christianity is the teaching that, provided our desires are rightly ordered, we should embrace suffering for the sake of love (which is desire).
Suffering in itself is not viewed as good. It was not our original state, nor was it what we were intended for. However, it was through the fear of suffering and death that our race became subject to evil. Thus embracing suffering and even death for the sake of love is the remedy. Jesus is the highest and perfect example of this. It is often misunderstood that Christianity teaches that we are saved by the punishment Jesus took. That by taking our punishment, he satisfied God's wrath and justice, God's need to punish someone.
On the contrary, we are saved not by the amount that Jesus suffered, or was punished, but rather by the amount that he loved. His willingness to suffer and die for us was the ultimate expression of his love. It is this love which reconciles us to God.
Suffering, pain, and illness can also be accurately described as states of brokenness. They are experiences of loss, but they are also the result of, and our experience of, the brokenness of the world and more importantly our own selves. This can easily seem to be our fundamental state because we ourselves are broken since the fall, and the world itself is broken since the fall. In terms of experience, none of us have ever experienced what it's really like to not be broken. Or what it is like to not live in a broken world.
But as CS Lewis pointed out, this very fact strongly suggests that this is not our fundamental, natural state. Because if it was, we would not know it, and we would not know it's wrongness. The very fact that we know suffering to be wrong, suggests that it is not our natural state.