To me it's mostly just a matter of what you're looking for.
The first "real" account I have, with a Beelzebub from the pre-reg, is pretty good. I don't have any particularly amazing himes on it aside from Artemis and the Event Eidolon is the best one I've got, but it's still a very strong squad.
When I started rerolling I got Dark Amon and Tyr, and that team is fucking bonkers. I don't even have a good Eidolon on that one, but those two plus Mortred shred everything the game offers solo right now even with an Anzu support Eidolon.
Now when I reroll though I'm mostly just looking to add Anzu-based squads to support my first two. I rolled Michael and Belegor(?) the two new SSR and SR Light himes yesterday, and I kept that one just to have it. But I've thrown away a bunch of other arguably ridiculous rerolls now just because I have no use for them. I just roll for more Anzus now and pretty much ignore everything else.
If you get a squad that's "good enough", it's worth at least playing through to the first 3000-jewel gacha just to see if it gets any better I think. If it ends up complete trash you might as well start rolling again, but there's only so much power you need before you think "Wait, why am I even still doing this?"