Well, you did what you should in this for instance, in that you disliked the review and deleted it.
However, I'll address part of your post, as to it being an opinion. What are reviews after all, but opinions of your readers? Yes, most would prefer something more in depth, such as reasons WHY this user disliked the story. Or, in other instances, why they like a story. But, short as it was, it's still technically not a troll post, nor even a flame.