Well it was a HUGE fail last night. I have to say all in all this whole damn event was a miserable failure and Arenanet should seriously take a look at how they plan to implement the next one.
Lag wasn't such a big problem last night, but there were so many people that half of them didn't render and the enemies only rendered when they were right on top of you.
People were dying in the hundreds due to the OP nature of the enemies, at one point EVERYONE on the server was wiped. This nonsense dragged on for one hour (an hour in which you get no fucking drops) before we finally finished the first phase. I didn't hang around to see the next slaughter.
All in all, FAIL...
I leave you with this little postcard.