Dragon's not perfect but I wouldn't say his hype has been ruined. He's still Sabo's superior and he's been getting more focus lately than usually so I still expect big things from him. That flashback left me hopeful Oda will continue exploring his character and him seemingly being the one to train Sabo leaves me hopeful for Dragon's strength (that and him being Garp's son and Luffy's dad).
Mihawk is fine. Huge bounty, usual World's Strongest Swordsman hype, co-leader of Cross Guilde, he's doing great. Cross Guilde actually allows Oda to give Mihawk some agency rather than just waiting for Zoro. Hopefully he explores his character more. Marine Hunter was great hype as well.
The Navy probably got the most flack. There have been lots of changes in the One Piece world as of late and yeah, the Marines haven't been looking great. Disbanding the Warlords in place of SSG isn't too bad (reasonable even considering where Fuji and the royalty were coming from) but that occurring around the same time as the fiasco with the Revolutionaries getting Kuma back and escaping makes it seem iffy and now the World Government is trying to assassinate Vegapunk so the reliance on the SSG may backfire too.
Though on the flipside, Aramaki got some hype and feats in Wano. He was simply portrayed below the likes of Shanks and Kaido but that ain't bad when he also made clear Commanders have no business facing him. His fruit's pretty boss and he didn't even need to bust out his sword yet so I expect a bit more from him. The Admirals won't disappoint, depending on your expectations for them.
Overall, not every faction will look great 24/7. They clash and confront each other and it's not like every Bartle has to be some sort of tie, at times enemies get the one-up on you, not strange, plenty of time for the Navy to make up for it.