With maybe one exception, none of these are even nearly the worst I have smelled overall. These are just the "worst" I have smelled from some of my favorite houses... Please accept my apologies in advance as I know many of these have strong fan bases.
Odriu Ladamo (too much fenugreek/celery)
Micallef Red Sea (cumin fest)
Mona di Orio Rose Etoile de Hollande (lots of peach, less rose)
Hermes Vetiver Tonka (*way* too sweet)
YSL L'Homme (just about everything)
Dior Eau Sauvage Parfum (wears you down over time and not very similar to its classic namesake)