It was the 100th episode though. Most shows in this genre never see that number and WE are the reason it has come this far. One episode being nothing but fanservice doesn't really hurt anything. (And in my opinion it was wonderful of them to acknowledge us so much)
It was practically all fanservice, wasn't it? I guess it was meant as a thank-you to the fans and everything. Nice, but I wanted to see the writers' perceptions of who the BG ponies really were. Instead they just reflected our own ideas back to us.