Don't let that stuff get you down. There are a great many factors that affect how many reviews a story gets, most of which have little or nothing to do with how well it's written. To name just one, FFN has no age restrictions, which means that compared to AFF, it has an audience that is much bigger, far less discriminating, and more prone to gushing or flaming (either of which ups the review numbers).
I have two stories posted on AFF that I consider to be the best I have ever written. I literally sweated over them and (less literally) poured my heart and soul into them. And of all the stories I have posted here, they are the least reviewed and the lowest rated. Why? Probably because, unlike most of my other stories, they aren't porn. But the relative lack of attention to those stories doesn't mean that I think any less of them; I just know that they can't be measured with the same yardstick as my other stuff.