Despite having things to do, I couldn't resist doing a little experiment regarding reviews. I looked at the review-to-hit ratio of each of the 5 stories that I have posted both here and at Hentai Foundry, and I found that not only have my stories gotten more than twice as many hits on AFF as they have on HF, they have earned more reviews per hit here, as well. (Both ratios are low, however: The percentage of hits accompanied by a review was 0.28% on AFF and 0.16% on HF.) More subjectively speaking, the quality of the reviews on AFF has also been higher.
And that's all Science Boy has to say on that subject.