I was very happy with last year's Halloween event. I thought it was extremely well designed. I (and many of my friends/guildies) had a lot of fun. There were a few problems, but that was to be expected, since it was a whole new system. And they did their best to tweak things that needed tweaking as the event was rolling out. It should run much more smoothly this year, given that they have a better idea of how it should work.
The only thing I would like to see is.. more! More stuff added. More fun. There were lots of treats last year, but so many "tricks". I'd like to see some things expanded upon. I honestly loved it. All I want is more.
One thing in particular I'd like to see; Deadwood needs some love. It's been reduced to nothing but a tower. What better time than Halloween to re-expand deadwood?
Oh there's one more thing. BRING BACK SPIDERS!