I would probably feel the same about p3 if they hadn't screwed it up in the very last part. Now I am a bit miffed about it but not really angry (okay I was first but I chilled down irl before posting my comment on official forums first). Getting disconnected due to whatever cause from your overflow and thus losing your rights to loot the chest was not a good move really. The thread on official forums already got nearly 500 replies. They said they are looking into it. Here's hope they find a way to appease players a little. I'd really have liked to see the whole event and I guess I will have to check out Youtube for it.
Here's hope they are learning from this because it frankly felt very unprofessional in many parts.
I also felt the HPs on monsters were overdone. In general I feel one-time events in the open world although making sense in terms of story immersion don't really go down well if they are suffering from technical flaws. I am not sure how ANet feels about phasing or having a special type of overflow where the event is getting repeated so people could replay the event. What I am thinking about is that they could have an NPC out there whom after talked to would send you there. They could even make a 5-man version of it, tuned down and otherwise the same. That way they would prevent zone overload and desyncs between each overload as everyone can do it at his/her own leisure.