Reviews and comment are moderated on MacUpdate. There are a number of reasons why a post would get removed:
- The post used inappropriate language
- You're a developer posting positive star rating reviews of your own app
- You posted multiple comments and reviews on the same app, same version
- Your review or comment isn't about the app itself but about something else unrelated
- Your post contained blatant mis-information that was not true
View out Community Guidelines for more details.