I recall playing City of Heroes, and while CoH was fun, if you got a LOT of people in close proximity with stuff happening (zone wide events, such as alien invasions/zombie invasions, were severely prone to this), the game got pretty slideshow-esque.
And IIRC, CoH zone instances were limited to 40-50 people.
Watching these lugnuts brag about how they're gonna have EVERYONE in the same instance? Sure, pull the other one.