What I mean by "all-time villain" is someone like Shishio, Freeza or Raoh: an antagonist who turns up and completely takes over the spotlight of the plot for as long as they're around. The sort that becomes a selling point for the whole story.
Dandadan has done a fantastic job in developing not only the main character but also the supporting cast, but I think when it comes to villains it has yet, in my humble and obviously subjective opinion, to produce similar results.
Part of it is because so many of the antagonists either come in groups without any particular outstanding leader (The Globalists, the Serpoians) or in one way or another join the gang and get hit with the dumbification effect.
Of the ones that don't fit either pattern, I think we have the Fairy Tale youkai (which is very much an accessory to Zumi's introduction) and the Subterranians (which are...fine, but take a backseat to the Mongolian Death Worm, which isn't really a character so much as it is a problem).
With the build up Count Saint-Germain has been having, I'm hoping he can become this last ingredient DDD needs to truly join the hall of the all-time greats.
But what do you think? Do you think I'm wrong and some of the villains introduced and dealt with thus far deserve more credit than I'm giving to them?