I don't see how being an extraction shooter is a negative by itself. It's just a genre. Genre's can be good or bad. Depends on how it's implemented.
On the contrary. Destiny was a looter shooter, which was basically brand new. That genre was fertile ground, and the genre alone was exciting. Extraction shooters were the hot new thing back when Marathon would've been put together, indicating Bungie are more than likely chasing a GaaS trend instead of creating a new one. If Naughty Dog announced a new Battle Royale, I'd be just as skeptical, because a genre tells us a lot about the project.
Bungie, and frankly most GaaS developers, are navigating a complex landscape of how to monetize their games and keep the audience engaged. It's not exactly straightforward, and they were pioneers in that respect, so it's not unexpected for there to be stumbles along the way. Many GaaS titles are forged despite these challenges. I would not say that Destiny has the "worst design/structure" in gaming, in fact it has one of the best - there's a reason it has amassed a huge audience that still continues for 10 years after it launched. That's not an easy feat. And it's because the gameplay loop, mechanics, and loot structure is generally highly addictive and appealing. Yes, it has a lot of issues surrounding the organization of all the countless amounts of content, but the core game is absolutely sublime to play.
You're conflating the "30 seconds of fun" gameplay loop with Bungie's game design and structure. Being as Destiny's loop basically copied Halo's loop, we know it's rock solid, and so do Bungie. The structure
around it was MMO-lite, and Bungie's implementation of it has ranged from "fine" to "crisis meeting at the studio before they go bankrupt". Their new player experience is legendarily bad, and it has been almost since the beginning. The activities range from "wtf were they thinking" to "Vault of Glass". Bungie can make terrific gun play - the best around, in fact - but in terms of crafting everything else, they're hit and miss at best. That's not a GaaS thing, that's a Bungie thing. Their name was built on Halo, and the names that built Halo are gone. Their current studio is built on Destiny, and those names are gone, too. "Bungie" isn't enough to get me interested in and of itself, and that'll be true for a lot of people. "Bungie extraction shooter" sits alongside "Early access survival crafting" in terms of interest levels.
All I am saying is that there's enough that we've heard about Marathon thus far to be excited about it if you are open and not outright dismissive of the extraction shooter genre altogether. I don't think Marathon is guaranteed to be an AAA hit, but at the same time I think it has the strongest chance out of any new GaaS project in development (non-Sony included).
Which comes down to "Marathon could be a great extraction shooter", which is true of any unreleased extraction shooter. But extraction shooters have never been as big as Battle Royale, and Bungie's name isn't worth what it once was. Add them together for a sizeable "wait and see". So, until I see some gameplay, I'm not seeing anything that declares Marathon as "Sony's next AAA multiplayer hit".
