It's not that the maps are horrible in themselves, but they aren't worth paying for them. If they were just standard maps already in the game, they wouldn't likely be anyone's favorite, but they wouldn't be hated, either.
They're actually pretty bland for DLC, at that. Maps like Vortex, Longbow and Ragnarok already provide what these maps are meant to bring ... but they do it better and they came with the game. --- Lali-ho!