Has there been a more well-received or better designed expansion launch event in WoW?

Or, hell, any MMO?

Top to bottom, the Legion invasions have been amazing. I mean, yeah, Blizzard is essentially bribing everyone with loads of free XP to avoid slogging through the content in their own game. That’s the thing though: everyone is involved. Leveling alts? Get in there and gain 1.5 levels per Invasion. Already at max level? Get chests of raid-worthy loot. Already geared out? Have some lucrative toys to sell or appearances to unlock.

All of this is fairly unprecedented. Hell, I had to go back and look up what the prior pre-launch events even were. The last notable one was the Scourge invasion back before Wrath. Sure, that was fun for a time – I still remember actually role-playing a paladin as I griefed players trying to turn into undead (by Cleansing them) and/or releasing their shackled souls once they turned. What of the others? An Elemental Invasion for Cataclysm was just a convenient way to stock up on, erm, elementals. Mists was… Theramore scenario? I still haven’t seen that in-game, and I’m not even sure I can. Then there was some max-level Iron Horde nonsense for Warlords, yeah?

In any case, this current one is currently the new bar, IMO. It involves players of all levels, and provides incentives to players of all gear levels.