For me, resteeming is limited to posts that either totally gave me a "wow!" feeling-- typically created by some of my favorite contributors here, OR posts I feel are important to the community from more of a "public service announcement" angle.

Upvoting? To some degree, I am motivated/guided by my writing and editorial background... I consider the content and evaluate whether it adds value to Steemit overall, as a "content venue." As in... if I were surfing along and saw this collection of content, would I think "cool site, I'll check this out some more?"

I'll upvote at 100% for things I feel are "solid" and "add value," and then scale down to about a 20% upvote for content I see as "passable, but not spam or spun content." I see my task as a "vote caster" similar to being a magazine editor who gets 100s of submissions... the good stuff gets featured, the OK stuff gets put somewhere "in line" and the junk gets ignored.