I am probably cheating because this coin is a fake, so it is not really a coin, just a disappointment. I did get my money back, but I really like the type and it turns out real ones are very pricey. John
Probably my three least favourite that are actually in my collection (as opposed to the "for sale or trade" box) are these: Poor metal, ugly "nose mishap" (as @Sallent put it... I think we could probably have a long thread on nose mishaps!) and just generally meh. But Geta as Caesar just isn't high enough on my list to have prompted an upgrade yet, I guess. Marius ant., a real "hole filler" that strikes me as just barely better than an actual hole. (Pretty nice reverse, but I'm a portrait guy at heart.) Johannes. I shouldn't complain since I finally have one. But still, again I feel it's barely better than the hole it fills.
I never liked my Dacian Volusian. I'll probably give it away when I find a different coin of Volusian
It's hard, but if i have to make a choice, i should said this one of Aelius because this coin doesn't tell a story for me.
Here's mine....In my defence I bought it to show differences in die variations so wasn't really that interested in the overall look, but now YUK!...Paul
Well Mat, you know me, I don't know what I own so kind of hard to say my least favorite. I would have to go with another answer here and say the old slugs. It is sad that they couldn't survived all of this time in at least semi-collectible condition. I know this all too well since I threw about 40 in a small box last night going through some of the piles.