I'm just going to get straight to the point.
The comment privilege page show us when to comment:
When should I comment?
You should submit a comment if you want to:
- Request clarification from the author;
- Leave constructive criticism that guides the author in improving the post;
- Add relevant but minor or transient information to a post (e.g. a link to a related question, or an alert to the author that the question has been updated).
Now, whether it's on Stack Overflow, Programmers.SE, or any other SE site, I see a lot of:
- "+1 for mentioning [fill in blank]"
- "What a great answer!"
- "I loved this answer so much I just had to leave a comment!"
None of these comments are relevant to any of those guidelines. So my question is:
Should we be flagging more of these types of comments, or have the guidelines changed over time and just have not been edited.