[kej]

As a counterpoint, I found HPMOR to be incredibly disappointing. It felt like a brilliant idea squandered on author-insertion proselytizing. This review sums it up better than I can, and I think I enjoyed reading the review more than HPMOR itself: https://danluu.com/su3su2u1/hpmor/

[aerovistae]

This reviewer and I had similar reactions - a quick page search for "Ender" shows he too finds the fanfic repeatedly imitating that story.