Sanchez doesn't say that the current HB is bad, but that it is not what it used to be. Vintage HB had a very special, atmospheric, dreamy quality to it. Very serene, with almost edible nutty notes, but never falling into gourmand territory, and with some kick from carnation-like notes. The current one is not completely different, but in my opinion it has lost some of the dreaminess and near edibility of the original. It feels less unique, it is a very good, slightly spicy floral, but without its original feel. Unfortunately, some of its main ingredients have been severely restricted, in particular heliotropin (almondy, mimosa like notes) and eugenol (carnation-cloves), so there's little one can do. And there wasn't really anything like it in recent perfumery, so there's no substitute (Apres l'ondee did share some of the structure of HB, but apparently it has also changed because of the restrictions).
So, in sum, the current HB is good and if you like it, go ahead. But if you get the chance, try to smell vintage as well. As you say, vintage Guerlains reach such high prices that one should not even try to purchase without proper experience and knowledge. And, as usual, who knows. One can get lucky and find a vintage bottle (in this case, vintage means pre-2010) in a brick and mortar store for a reasonable price.