I had an amazing guild during WotLK, but that was after about 5 years of kissing frogs, so to speak. I actually wouldn't have met any of them if the LFG tool had existed at that time. This was back in the day when people added players to their friends list to look up for groups later.
The past few times I've tried guild shopping since WoW have been colossal failures. I'm very up front about the type of person I am and what group of people I'm looking to surround myself with, but most guilds are only interested in padding their numbers and want to recruit regardless of whether or not it'll actually be a good fit.