@ajn142@infosec.exchange latency, distance, SNR. Not sure precisely how it arrives at good vs fair vs poor, but we pretty regularly get somebody with an iDevice complaining about how unusable the Wi-Fi is in certain locations that are particularly prone to nearby roaming. I get called in, I see the Wi-Fi is fantastic and the they're still connected to a barely visible AP at like -85dBM or worse, I make them disco and reco, and "oh wow so much better, thanks for fixing the WiFi!" Lather, rinse, repeat.