Dragon Quest was the one I was most disappointed in. I do like the episode for various different reasons, and I don't consider it really bad (I love the interactions between RD, Twi, and Rarity). However, with as interesting and complex as I was hoping the relationship was going to be with Spike and the other dragons, I was pretty let down by the fact the only dragons they gave personality to, other than Spike, were just being one dimensional bullies. Generally, his episodes have been "meh" for me. Nothing all that great, and not my favorite, but not the worse for me either.