In reading the comments so far, I suspect that many may be missing the author's main point: the real intent of the mass.  I've actually heard many such definitions over my life, and some make me cringe.  I can live with the idea of "help[ing] form the participants into the Body of Christ."

That word "helping" is the right way to start thinking about this, as I see it.  I've long believed that what happens at the Mass is a lot less about what the priest does, as it is what WE do.  It may be hard to describe, but perhaps one facet of this is that we learn to see each other, not for where we are different, but for how we are alike.  We may be at many different levels in our faith development, but there is a commonality in that time next to each other: a sharing of what we are perhaps, or an acceptance of how we are part of something bigger, or maybe a chance to reach out to another.  The mass can be a lot of things, but a good place to start is to recognize what draws us together.