I'm actually fine with an excuse plot to let us adventuring in exotic settings. Too bad we're stuck with Ezio's timeline, but they're at least trying to keep things fresh with the Tower Defense and Portal sections and everything.
The downside to this is that the game starts feeling bloated, but if you're stuck with the order to make a sequel and the old one is already pretty well received, what else you gonna do to make it seem like a game worth your money? Hopefully AC3 will make a skip in technology again.
I really liked the upgrade from AC1 to AC2, but Brotherhood felt like a huge letdown. Story-wise much more mundane than the predecessor, gameplay wise not a lot of interesting changes, it felt like more of the same in a less compelling context.
After playing Revelations I try to ignore Brotherhood or think of it as a Beta. Revelations had a much more interesting story, setting and new gameplay additions - tho the hookblade seems pretty unnecessary for almost all its uses. I guess it's like an Assassin's walking cane when they get too old to grab ledges themselves or maneuver around people or kick their legs out of the way or steal a purse.
Story-wise it still can't reach punching the pope, but at least you get to see the closure to Altair's story, that was more interesting to me than killing the dudes in Brotherhood.
UbiSoft is infamous for stretching out franchises - pretty much killed Rayman - so I actually hope they are gonna do the Templar's side of things yet. I mean, do we know for a fact that the Templar-ruled present is that much more terrible than what the Assassins could've offered? Templars could argue that hivemind Earth could finally complete achievements made impossible by personal quarrels and bickering, elevating human social structures instead of just technology for once.
I'd really like it if they could show the other side of this struggle. Even 16 sarcastically recapped the Assassins are the good guys and the Templars the bad guys, like it's ever this simple. And especially in recent games a lot of Templars actually come off as well-intentioned extremists rather than pure assholes.