What are your favorite memories about WoW?
Mine come from vanilla and BC, and they have to do not with the game at all but with the community, the social element. My favorite memories are things like when I ran the top PvP horde "guild" on my server in vanilla (I say guild in quotes because we weren't a formal guild but more a group from various guilds that got together in a custom channel because Wow doesn't support circles) and we were playing the top pvp guild in warsong gultch and we just stopped in the middle of the match and hung out and used the moonwells as saunas and just chilled and goofed off. I enjoyed how when you levelled,usually there were people on your faction and the other faction that were leveling roughly at the same speed as you and they went to the same zones, so I'd see the same levelers in STV and then in badlands or zangarmarsh to terrokar or wherever. The same guy might help me multiple times killing various elites, or the same opposite faction guy might pvp me in multiple zones over the several days. I remember the afternoon when the gates of AQ were opened, and the other faction used that event as an opportunity to raid Orgrimmar because all of the best players would obviously not be in town during that event and they slaughtered everything. I remember in BC I assembled the first pug clear for Karazhan on my server and detailed the fun of assembling the team to clearing all the mobs in a running thread on the realm forum and people would read along and comment. (We even had Attumens mount drop of all things).
I don't have any fond memories of Legion. Its just kill mobs, get loot, whatever.