PSA: If you agree or like a post, upvote it
Nobody is going to hurt you for upvoting something, hell, you only know whether you upvoted it or not.
If there is a thread saying "Yasuo is op" and you agree with that, then you have every right to upvote it, assuming you enjoy the content of the thread itself.
And if you comment, leave a rating.
This can be a downvote or upvote, but if you are gonna take the time to comment on something, at least give it a little curtesy on the way out with an upvote/downvote.