Good topic. Don't have time right now for a full report, but I just wanted to write that I had planned to go out with a bang yesterday, given that I still didn't have a strong Lugia or Articuno despite catching plenty. Had been really unlucky with IV's.
Result: Did 7 legendary raids yesterday - most with a group of more than 100 people - caught only one. ONE! I couldn't believe it. I wasn't throwing bad or anything. Always got 9-12 balls. Hit almost everything. Usually nice throw or better. Always curved. Almost always golden razz. Oh, and the one I got? A low IV Moltres. Doh!
Anyway, I will power up my best of each of the four birds over the coming days/weeks depending on how fast I want to spend my dust.
My overall catchrate has been pretty poor. Was just below 50% before yesterdays catch-disaster. Have caught something like 30 legendaries in total.