I was invited to the one I am in now. We did have quite a few active members, but after that /movelog we lost about half the members (and over a level of exp). Don't know if they just got mad and quit the game or what.
I think this early in the game it is kinda hard to tell who is going to become the Elite guilds so to speak. But if you get into a guild that seems to be fairly active go for it.
Something also to consider if your under lvl 15. If you become a patron and do writs for your guild, they are ALOT easier before lvl 15 then after. Pretty much any writ I have done past 15 has involved higher lvl grouped mobs in stormhold or Blackburrow, as where pre 15 was killing soloable mobs in antonica usually.
____________________________
Hi