Right, you can’t get it anywhere else. But I still don’t know enough, so I still can’t say. All things being equal, when I see someone who has a rank below about 12,000, I just tell myself they might be pretty good, and if I see someone in the single thousands, I usually give them credit for being good until I see reason to believe otherwise. Players with a rank in the hundreds, I assume are very good, and/or have been playing here for a very long time.
I don’t think about it anymore than that. I think about the cards, pot odds, implied odds, position, stack sizes, and a bunch of other things. Very often when I’m in a tournament, I’ll hover around and see players with a rank in the low thousands holding the small stack. Sometimes they’re still dangerous, but I don’t worry too much about them until their stack grows enough to be more of a threat. I’ll give them some more credit when they decide to get in a hand, but that’s about it.
I feel I can play against anyone on this site that I’ve played against so far. Some are a lot better than others, and I might not beat everyone regularly, but I relish those battles because they challenge me to become a better player.