My first DLC was Mario Kart 8 DLC. Well worth it in my opinion. The next DLC I got after that was FE: Awakening Map Packs, which were fine, but definitely not worth the price. Those packs were the reason I never invested in Fates Map Packs.
I still haven't really purchased any DLC since those and, if I have, it's been mostly free stuff like the additional characters in Master Blaster Zero that were free for a week or two when they came out. I would have gotten BOTW's, but I need to see about the story addition before I pick it up personally.