Exactly, it’s an education for readers/reviewers, too. It’s a skill!
Some people genuinely weren’t taught that sharing a subjective opinion is different from providing concrit. We can’t constructively act on opinion unless you qualify why you think it would improve the story.
It’s fine to share an opinion, especially if it’s just “ahmahgahd I loved this, especially the way he– and then the moment they– ahhhhhhhhhhhh–”
But if your intention is to help us improve something tell us WHAT and WHY, e.g. “Just a suggestion, if you want to enhance the pay-off of the long journey to-date between these characters, I think the wedding was a key opportunity for an emotional climax/catharsis. Cutting away early didn’t give us the opportunity to see them testify their commitment in front of witnesses, which we know from their personalities would have been a difficult and moving moment. Since we didn’t get to see that here, I hope we’ll get something in the future parts for that pay-off. If not, just something to keep in mind for future, but thank you for giving us this!”
Approach it like you’re having a conversation with a friend you respect and are fond of, so I personally try to balance humility, encouragement, affection and advice. They’re not obliged to take my advice. They’ve given me a free gift. And I want to enable them to make one even better next time, if they find my thoughts useful.
Leaving concrit also makes me a better writer. It makes me think about what I liked and why, what I thought worked well or what I would do differently. I learn with every review how to do it better. But sometimes I just say ‘THIS WAS BEAUTIFUL’ and that’s all that needs be said.