Wlad is the most boring because he has advantages in size and skill and always plays it safe using only a small portion of his skills (jab, jab, grab....jab, jab, right), those other fighters use the full repertoire of their skill plus go to the body and slip punches to counter. None have a style I'd call exciting though.
Put mayweather, hopkins ,rigo, ward or any other featherfisted boxer on the list and I will not vote Wlad and that has nothing to do with racism. If you ask me who is more boring mayweather ot mathysse, that's mayweather for sure, but if you ask me who's better boxer, I'll say that's also mayweather.
You must have missed the post explaining why the poll was created as such. In the defense of those other boring fighters, they fight much better comp with no significant size advantages and use a mucher wider variety of skills.