For the third time today on my realm (chrommagus) on alliance side was unable to complete this event in one hour.
On a good day we might have 60 or 70 80's online and during non peak times maybe 15 - 30 and of course 100% never participate.
I find it really frustrating that this event is so dependent on a solid participation.
On a low pop server we literally don't have enough people to beat the event in an hour and certainly wouldn't be able to defend both Ironforge and Stormwind

I dont know how it is on a high pop server, I'm assuming that its more of a zergfest and the event is over pretty quickly but i think that blizz might want to implement some sort of scaling based on population, its just sucks to never succeed.

QQ aside, any tips on how to get this done with about 20 people?