Yes/No/Maybe, its up to you, are all answer to your question.
This is personal and case dependent. In my view everything I edit is perfect (up to my low standards of just good enough most of the time, but does it's job well), so I give it up-votes after editing and move along. If I see something nice I up-vote and move along. Do we really need rules for up-voting or down-voting anything?
You don't need a up-vote rule, do it as your conscience tells you. You don't need a down-vote rule, do as your conscience tells you.
Votes are great but you need to understand that each case will be different and each user will vote according to what they believe a good post is. There are some quality standards that should apply but in the end its up to what you do, no rule can define that.