The concept that +4 faith x 8-12 cities is only 32-48faith per turn is off-base. What the OGO gives you is LOTS OF EARLY FAITH, which snowballs.
No, it doesn't. You don't get that Faith early because you don't have cities and Obelisks early. You get that Faith gradually as your cities come online and build Obelisks. So, by turn 100, you're probably at 8-10 cities and 32-40 Faith. That's not really early.
I guess the calculation might be different if you're on a conquest spree and using the AI's Monuments, which turn into Obelisks. But then, vampires are probably more fun.
It snowballs into early pantheons, Classical golden ages, more faith-generation capabilities, and a very strong faith-based gameplan that you get to set up very early.
You'll almost certainly have a pantheon before you have an Obelisk. Even with the extra Faith, you're unlikely to build a Monument in the first 30-35 turns. Sure, maybe if you get a bunch of Industrial city states and you have tons of room to expand and you're playing on Prince or something. But otherwise, you'll be focused on expansion. Your second city can build an Obelisk, certainly. But you'll have a pantheon by then.
Of course, the Obelisk doesn't help you get a golden age. You still have to earn that on your own. Nothing about Voidsingers makes it easier to earn a golden age.
But, let's say that you do earn a classical golden age. Maybe you've got ~3-4 cities already and they're producing 12-16 Faith from the Obelisks. I guess that's OK? Not enough to do much with monumentality, though. You still need other Faith sources to really make it work.
Look, nobody is saying that this is a
bad ability. It's certainly not! It's pretty good! But it's not game breaking, overpowered, or whatever other exaggerated nonsense I keep reading.
And then, once you're set up, those OGO's give you a place to put the basically-free relics you're generating.
Free? The first Cultist is 110 Faith. You get 4 Faith per turn from the Void Relic in most cases, so that's 28 turns to pay itself off. Every Cultist after the first costs more. Also, you can't get the Cultists until Industrial Era, at which point they aren't really all that useful unless you have Reliquaries or something. Even then, you're probably better off spending your Faith on Rock Bands, if you can.
Better to use those slots for other early great works that you otherwise couldn't use, I think. Artists that don't theme with your other Artists, Musicians before you get Broadcast Towers, etc. Sure, fill in the rest later with Void Relics, but 1) they aren't free, and 2) eh, they're OK.
There are exceptions, of course. There always are exceptions. But, for most civilizations in most games, Voidsingers are "great, not broken".
Thirty-three production from one tile is insane. 
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