I want to be clear, when I say, "in my circle", that's not code for me saying "in my bubble" or anything. I spend a ridiculous amount of time on youtube, rotten tomatoes, etc looking at entertainment reviews, looking at what's coming out. I hear about a lot of things that my friends and family don't like and I watch some of that myself. My point is, if I consume the amount of entertainment news that I do and i'm not hearing anything, it just seems to me like it's not something that is widely known about.Peacock AFAIK isn't on Nielsen.
Either way, I think you're discounting how how good Google trends are at actually acting as a surrogate for ratings on streaming. Multiple streamers use what's basically a more sophisticated version of it to track competitors and efficacy of their own marketing campaigns.
EDIT: My main hope is that we move past the idea that just because something isn't talked about in your circles doesn't mean it isn't popular. Lots of things determine popularity of a show, and some things that make it hard to get a representative sample from just friends and family, like geographic location, are more influential than they're often given credit for.
Now if this was on Netflix, I think this show would be blowing up, possibly the #1 show of the week. People on Netflix love true-crime stories. I just am not seeing where anyone is going crazy for this show right now. It's probably performing solid with people already subscribed, but i'm not sure it brought in that many new subscribers (although if any Peacock show did, it was probably this one). So what am I saying? I'm saying it was probably a mild success for the service it was on, but you put something like this on Netflix, Amazon or even Apple TV+ (since everyone who owns apple products has the service), the show probably makes a big splash and gets everyone talking about it in it's debut week.