The Legion is a huge inter-dimensional army. Why can't they spare something more impressive than a few measly wyrmtongues to assault a zone? Why can't there be a huge fleet of spaceships that we have to fight, an even bigger command ship with a fully fleshed out interior that we have to fight through to get to the commander of the invasion? Why can't all the invading mobs be elite with Timeless Isle style 1 shot abilities that have to be dodged or interrupted? Why can't the Legion actually occupy towns and strongholds so that we have to liberate them? Why can't there be a zone-wide tug of war between the players and the Legion with the latter actually having a chance of winning and occupying the zone so that we have to liberate it later?
These so-called "invasions" are a massive step down from pre-event invasions. Why is Blizzard afraid to innovate? Why is Blizzard afraid to give us fun gameplay?