i'll be honest i don't get how you can be disappointed with this direct
like if it didn't showcase the game you wanted it just means it's not releasing before summer as this direct focused on spring & summer. there's E3 for that, but you may want to temper your expectation if you're anticipating half a dozen more major 1st party announcements for this year
I hate to single out Metroid fans, but I feel like most of the disappointment is coming from them. And I don't blame them for feeling disappointed. Metroid Prime 4 was delayed to who knows when, and there's been no announcement of Metroid Prime Trilogy.
Otherwise, 2019 is extremely solid for fans of Nintendo's other IPs.
Mario IP is covered (NSMBU + Super Mario Maker 2 + Luigi's Mansion + Yoshi)
Zelda IP is covered (Link's Awakening remake)
Pokemon IP is covered. (8th gen pokemon)
Fire Emblem IP is covered. (Three Houses)
Animal Crossing IP is covered (Coming soon)
New IPs are covered. (Astral Chain, Daemon X Machina)
eShop games are covered. (Box Boy + Tetris. There's more eshop announcements coming this year.)