I do enjoy 5D's and I totally loved the robot Jack episodes. It's true that I don't really like the villains. I don't think that they're too interesting or threatening for the most part. They don't really stand out to me compared to other Yu-Gi-Oh! villains. I actually don't mind the filler and it isn't nearly as bad as I thought it would be. So, I'm not so sure it's only because of the amount of filler that prevents me from finding the villains interesting. Though, it's good to know that the Duel Bots Primo sent out aren't forgotten. Since that episode gives Crow a Dragon card, I don't think it could be filler or at least I wouldn't label it as such. I have heard about how Crow was originally suppose to be a thief. Considering he didn't show any signs of being a thief after his debut episode and he was helping Yusei throughout the rest of the arc, I'd imagine that they changed that aspect of his character fairly early on, possibly even before he debuted.