My son attended Hornimans from Reception until July last year when he left to go to secondary school. He did well, had a good time overall and has largely fond memories. He, along with most of his year, got very good SATs results (if that's of relevance to anyone reading this) and I had no regrets about sending him there. Certain members of staff are better than others, like anywhere.
Every child is an individual so slagging schools off on the basis of one person's negative experience is neither helpful, nor an accurate portrayal of the school itself IMHO.