Curious how well fireteam-finding actually works

Haven’t played D2 since it first came out, but I’m curious about the matchmaking/LFG culture. For those of you who post here regularly — how often does it actually turn into a decent group? Do certain flairs (Raids/Trials/Clan Recruitment) work better than others, or does it come down more to how detailed the post is / how fast you respond?

Mostly just trying to understand how LFG posts work and what makes one successful.

Thanks