Started playing in the US beta - early on. There were no hunters, no druids, and the talent system had just gotten revamped and only mages and warriors (iirc?) had trees at all, and they were super weird.
I remember getting very excited about it after visiting the old World of Warcraft town hall website, which had a lot of screenshots of the game. I was particularly excited because I’d spent half the summer of 2003 playing on Warcraft 3 RP maps, one of which had a map of all of Azeroth in it - although the Warcraft 3 engine’s limitations severely limited what could be displayed. 256x256 maps, 16 ground textures… good times. Anyway, the idea of exploring the whole of Azeroth was just delightful.
My favourite moment in this game was probably the opening of the dark portal. I remember coming home from the store after having bought it, and when I walked through the Dark Portal, which I was very excited to do because I thought it was such a cool place in Warcraft 3 and especially in Warcraft 2, I was completely blown away by how alive and crazy the whole thing was. I was on a medium pop realm, so while I did suffer some lag, it wasn’t anywhere near as bad as it was on the really big servers.
And yes, I remember that image. And yes, I still have the disks. And yes, they still work. And yes, I still have an optical drive and… oh, what the heck! Feast your eyes!