Vergo was pretty good for what he was. He played his role fine, he was strong and intimidating and after seeing all he put Law through in the past, his fate was really satisfying. Oda handled his death well with Doffy's final words to him and I genuinely don't think he'll come back (same for Monet). Even his clash with Sanji was nice, from Sanji saving Tashigi who was in need and busting out some cool lines while sending Vergo flying to Vergo injuring Sanji, plus just the action all around looked good in the manga.
Shame a post supposedly about appreciating a specific character has simply turned into bashing Sanji or Zoro. I think Vergo can be a bit overrated at times but he was strong, especially for the period he was introduced.