I don't like to see feeds that are nothing but resteemed content, so I personally try to have no more than a 50/50 balance of original content and resteemed material in my personal blog.
Resteeming is definitely good for the community though, and I welcome the idea of established users who carefully resteem quality content more heavily as well as minnows sharing the posts of others as they explore.
I have found many interesting posts only because people I follow shared them.
I completely agree. I try to keep my resteems "under" the number of original content.