Fantastic Beasts is Potter, which has the best attractions Universal has ever done. You can be sure that the land will be great. Meanwhile, DreamWorks is a Universal-owned property with so many IP's within it. That could be a bad thing if they choose to do as many IP's if they can, or if they decide to go cheaper because they have no one quality-checking the land.
Maybe I'm being paranoid, but DreamWorks is my biggest worry for this park.