I would suggest that reviewers have the option to change (or append) their reviews. I subscribed to a system that performed very well for the first couple of months and I gave it a 5-star review. A couple of months later the system vendor abandoned the system without notifying the subscribers. I would like to lower my review to prevent people from subscribing to a dead system.
Just out of curiosity, is there something stopping you from posting another review?
Now that you mention it, I don’t see an option to review any of the systems I subscribe to – even the ones I have not yet reviewed. Maybe I’m just not able to find the button after the latest interface change.
I do fully agree with your idea as it has happened to me more than once! I tried to post a subsequent review but could not find the place to do it.