The requirement for agreement seemed to work well at preventing weird factchecks from anywhere on the political spectrum. I saw a fair number of people trying to use Birdwatch to argue with each other, bad faith factchecks, and so on. None of them made it to general visibility.
I wrote 45 notes. I tried very hard to keep them unbiased, but I'm human and I have strong political opinions. 5 of them wound up approved. I suspect the requirement for agreement tended to keep anything that's more than a little divisive from getting approved; no evidence for this, though. I'd be curious to know what the average percentage was for active users.
There are way more Birdwatch notes getting written right now. A lot of them are terrible quality. However, they mostly aren't getting approved, so I think the system is working as designed.