This answer is aimed at the case of new users.
There will always be some random downvotes on different posts, no matter what, and some will dislike Greek or some other topic.
Those are a different issue.
(Although I mention that I did edit the help pages and the tour to make the current Greek policy more official.)
We have two goals:
- Be nice to people.
- Provide good quality Latin content.
I hope we agree on these goals.
Goal 2 is our explicit goal anyway, and I think goal 1 is reasonable in any human behavior.
And it does help reaching goal 1; see below.
When a new user posts and the quality is not up to our standards, we have two goals:
- Welcome the user warmly.
- Make sure site quality stays high.
If there is no conflict between goals 3 and 4, there is no reason whatsoever for unfriendly comments.
If such comments appear, I am willing to instantly delete the bad comments and give a warmer welcome.
Problems arise when there is a conflict between goals 3 and 4: it is not a warm welcome to get negative comments and downvotes.
When a new post is completely out of bounds (spam or something), then harsh responses are justified.
Otherwise we need to be lenient.
Because goal 3 is important, we should start working towards goal 4 in ways that do not harm goal 3.
The first thing is that bad quality content should be improved, not deleted.
Some things are beyond salvation and some users will not react to comments, but we should give a chance.
That is, ask the new user to improve their post and give the time to react.
If they improve, thank them in a comment and vote up; that will teach in practice that improving posts is rewarding.
Try to focus on the improvement, not on the initial bad quality.
Suppose a new user posts an answer which lacks credible sources.
Do not write: "This answer is bad because there are no sources."
Instead, write: "Where did you find this? Adding sources would improve the answer a lot. Welcome to the site!"
It makes a difference.
Try asking a new user to give more information in a positive way.
If you want someone to behave a certain way, it is not always optimal to give them blunt orders and feedback.
Please refrain from downvoting for some time.
(See also my answer here.)
If a user does not react and the post is bad, then go ahead.
Try to give a positive first impression of our site.
It is much more important than immediate quality control.
If you think a post needs improvement, leave a comment guiding to do so.
If you are not in a mood to leave a constructive comment, skip the post and move on.
Sometimes commenting on new users' posts is a trade-off between goals 3 and 4.
Balancing between the two is not easy.
But sometimes leaving nice comments is not even a trade-off.
Goal 3 is really important.
Our site needs to grow to become viable in the long term.
Growing is only possible by getting new users.
We need to welcome them warmly if we want them to stay.
Many potential great users have no prior experience with the SE network, and they need their time to learn the ropes.
Give them the time.
I needed it and many others will, too.
If you find too negative comments at newcomers posts, flag them.
Concordia res parvae crescunt. And Latin Language Stack Exchange is a res parva.
When a new user posts something that needs improvement, downvoting should be a last resort.
Even if a post deserves a downvote, it can be better not to give it right away.
Veterans can take hits and still keep coming back, but not all newcomers can.
If the post is good, upvoting should be the first resort.