Yes, agree with you.
Centaur sculpt it's so ugly, the worst thing are the legs so short, moreover proportions and position are wrong too.
Which one is the second figure between 8 total (maybe you intend excluding Blemmyea) that you don't like and won't in your collection? The second place for ugliness sould be of Anubis...
The Blemmyea is the best (and perhaps most expensive) figure I've ever owned so far Fede!
Personally, I prefer just the pink version of him rather than having him in all 4 colours. So won't be lettin' him go that's for sure!
Apart from Centaur, the only other 2 sculpts I don't want is Leviathan and Amphisbaena. Reason being that first of all, Leviathan also has proportion and size issues when lined up against the others. Secondly, they both appear to have that same stupid wide-mouthed grin on their faces. Even on both heads of the Amphisbaena!
However I do agree with you as regards to Anubis's "ugliness" but I've included him in my collection due to the fact that he was incredibly hard to find in Blue colour. Ended up paying around $130 (inc postage) for him on ebay and was certainly worth the wait in the end.