Although accuracy does not seem to be priority with the promotional materials accompanying the FamilySearch.org Family Tree, it is a fundamental aspect of the Family Tree program. Because it has a collaborative wiki-based structure, the Family Tree will, by its nature, continue to become more accurate. This does not mean that those using the Family Tree do not have a personal responsibility to be as accurate as possible, it just means that over time, the Family Tree will become more accurate as the users become more sophisticated and the information becomes more complete.
My analogy is that the Family Tree is like a beautiful garden. But it can only become beautiful and stay that way with a lot of work. Just as we need to be vigilant about weeds in a garden, we also need to be vigilant and root out the weeds in the Family Tree. They will seem to pop up during some seasons in profusion, but if we ignore the Family Tree the weeds or bad data will soon take over. Just as weeding a garden is best done consistently and regularly, the Family Tree will grow and blossom into a beautiful, well organized and corrected Family Tree with hard work and dedication.
My admonition to all who want a lovely Family Tree is to get to work and be as perfect and correct as you can be. Add sources, correct the entries and think about what you are doing. Have faith that your efforts are worthwhile. Start to work and you will soon learn to love the garden (Family Tree) like I do. Take my word for it, it is worth the effort.