Have you guys ever thought about the idea that current Buggy is could be very powerful? This are my thoughts about his current possible powerlevel:
Since the navy chases Buggy, isn't it a good opportunity for Buggy to show his true strength? Imo, when he was introduced as an antagonist, he was VERY powerful, injured Zoro and was an opponent in which even Luffy extremely struggled. In fact, Luffy only managed to beat him mid/high diff thanks to Nami, otherwise the fight would be a lot harder.
And now we have Buggy apparently a huge joke character like Ussop's fake hype but it is really satisfying for a fellow crewmember of Roger's crew? I don't think so, he fought alongside with Shanks as well when they were cabin boys.
Furthermore, I don't think that Oda will keep doing this entire joke charade about Buggy, especially since his DF has lots of potential to be very powerful.
Thus, this is the moment when Buggy will shine against his enemies - imagine Buggy using CoA/CoO/CoC with great DF mastery... If there are Vice Admirals on one of those ships, Buggy could show his true strength against them.
Therefore, Oda prepared lots of surprises at us with this clash; the fandom WOULDN'T EXPECT this outcome at all! Buggy actually being powerful and truly worthy of being an (ex) Warlord.