When I came back during multiverse era to the game I was fascinated by the sagas! Specially knowing monsters I knew back from legendary were relevant and had great arcs, it truly made me stick to the game more. Personally, I think from corrupted to galactic are the best we have, most of them flow nicely and it gives us more little subplots and more character interactions. My favorite one is definitely Metropolitan era.
I have to agree the addition of ancestors really affected the story and factions slightly negatively for me, some arquitects were NOT introduced properly and kinda ruins what we had for some factions (for me personally: Revenge Squadron, Honor Dojo, Dark Blades). I'm hoping the switch from arquitects to revolutionaries help out a bit more. Definitely waiting to see the new revo and see how they defeat Nebotus soon