First and foremost - we are adjusting the rep rewards as we speak. This is a beta. Stack Overflow Q&A had reputation rewards adjusted over the years (question upvotes got reduced from 10 to 5, question downvotes stopped costing reputation, etc). As much as I'd love to think that we'd get this right on day 1, that's ... unlikely. :)
We're deploying changes now that reduce reputation awarded for edits from 10 to 5. We are also raising the thresholds for what a "substantive edit" is.