I kind of agree with you, and also kind of disagree. Personally I only do it for projects I publish that are big and are worth attention (Feature-worthy). I don't mind new topics about such projects, but I do think smaller projects should be kept on general topics. Also remember some people ask for feedback on their games, not just to get plays/likes.
I agree. Like the OTML guidelines say, you should only use it for topics that where people can contribute to discussion.
It is okay, just as long you are not too specific. If your city is quite large, it will be okay. It will be hard to track down one person in a large place, such as New York City.
I definitely agree.