I feel like this argument is pretty disingenuous to the character at this time. This would be like saying Mihawk is garbage because all he's done so far (physically in the manga) is no-diff east blue Zoro and cut a frozen tidal wave lol, yet everyone here bases Mihawk's prowess from his title, the WSS. This is the same Mihawk that got his slash blocked by Joz.
Consequently, people should do the same for King. The value of King is higher than Queen, that is a fact. The title matters here, just like it matters for Mihawk. Lets wait until we actually see more from King before making rash statements.