<p>@Glen_b has provided a nice answer.  I agree with most everything (except&mdash;being very opinionated by nature&mdash;that it's hard to judge a lot of reviews).  Here's my 2&cent;:  </p>

<p>Just go ahead and do something.  Do whatever seems like the right thing to you, but do something.  There isn't necessarily any such thing as the 'right' action really anyway.  For the most part, what turns out to be 'right' emerges from the collective actions of the community.  For that to be the case, you need to throw your actions into the mix.  </p>

<p>Even if your opinion goes against the consensus, it is difficult to do much harm.  If you leave a comment that someone else disagrees with, they can leave another comment.  Edits can be rolled back.  A flag can be declined by the moderators.  It would take four additional close votes to actually close a question, but it can be re-opened without much difficulty.  Etc.  </p>

<p>Just give it your best shot and do something.  In my opinion, most new posts need some editing, so edit.  Many new questions need some kind of additional information or clarification that the OP doesn't recognize, so leave them a comment.  If there is nothing worth editing and no comments are necessary, that suggests (to my mind) that an upvote is in order.  Or you could just leave a friendly comment (e.g., "Welcome to CV.") as @kjetilbhalvorsen often does.  Just do something and you'll be fine.  </p>
