Well I’m not a fan of wine. But mulled wine seems like it’s evil cousin.
As it happens, I do like wine, but I tend to drink only good wines.
Re mulled wine, yes, it can be awful, as, a lot of people make the mistake of using cheap wine with which to make it; their reasoning probably runs along the lines of, after all, so much else - spices, flavours - are going in to the wine, who cares whether it is good or not, or can you even tell the difference?
Unfortunately, you can.
Having said that, I tend to prefer it either when I prepare it myself, (quality control issues loom large), or when someone from central Europe - Germany, Austria and so on - or the Nordic countries - who know all about mulled wine, will undertake the task of preparing it.