I didn't like the Halloween one very much. It just didn't have that good old pony feel to it. In fact, I haven't really liked ANY of the season 2 episodes so far.
I guess maybe it has lost it's appeal to me now that Faust isn't working on it anymore. I'll still watch them because I think ponies are awesome, but the stories just don't do it for me anymore. I didn't like Luna at all. Discord was a total disappointment (well, other than his voice).
The thing I liked about the season 1 episodes was they weren't too focused on telling a story, but rather opening up the characters and showing us who they really were. That's what they USED to do with good shows. Now they just focus on making a quick show and a quick buck that only focuses on keeping you glued to the screen for the 20 minutes. The season 1 episodes gave me hours of things to think about after the episode ended. Now it's just like watching a cheap 20 minute cartoon. Once it's over, you really don't think about it.
