So basically, what we got since january;

-Bayonetta 1+2 (92 on Metacritic, one of the greatest games of this generation)
-Kirby Star Allies
-Donkey Kong Tropical Freeze
-Captain Toad Treasure Tracker
-Mario Tennis Aces
-Fortnite (one of the biggest, if the biggest, game of the year)
-South Park 2
-Wolfenstein II
-Crash Bandicoot N-Sane Trilogy (one of the biggest ps4 games of last year)
-Octopath Traveler
-Paladins
-Naruto Ninja Ultimate Storm Trilogy
-Street Fighter 30th Anniversary
-Megaman Collection
-Dragon Quest Builders

And here what we'll got 'til the end of the year:

-Dragon Ball FighterZ (the greatest DB game of the generation so far)
-Dark Souls Remastered
-Super Mario Party
-Pokémon RPG
-Super Smash Bros Ultimate
-Fifa 19
-NBA 2K19
-Megaman 11
-Monster Hunter Ultimate

And I forgot a lot of games on that list.

I don't know about you, but that doesn't seem to be a dry spell for me.

Personally I think this first half was pretty good for me.
1st, the lack of huge games allowed me to play more of the ones released in 2017 and allowed me to complete a ton of games.
2nd, I had a game to play just about every month but April. (For me)
Jan was Rocket League (physical) and Lost Sphear
Feb was Bayonetta 1+2
March was Attack on Titan 2 and Atelier Lydie And Suelle.

and then May was Battle Chasers Nightwar (which I highly recommend) and Yonder. 

I also purchased a large variety of indie games such as Mulaka and Fe.

Now, for the average gamer, none of those games would probably appeal to them. However, for me it was great. And after the end of June, I’ve just been flooded with games and now I feel like I have too many to play.
In just June was Fortnite, Paladins, Minecraft (physical) Ys VIII, Wolfenstein 2 And Crash bandicoot, with Shining Resonance and Octopath a few weeks away. Thankfully there’s a little break before Monster Hunter but still.

-Super Mario Party
-Pokémon RPG
-Super Smash Bros Ultimate

These are the 3 big strategical nuke strike of the year for the Switch.
I don't know but maybe it would have been a little better strategy to release one of these 3 somewhere between March and August. Just to maintain a higher momentum.
Between Kirby and Mario Party we have a dangerous big hole for the health of the console.

You can't make a statement based on your opinion 

" I don't know but maybe it would (...)"

The Switch *is* killing it. Don't let Don know.

All I want from Nintendo is 4-5 new quality exclusives to land on their system a year. If they can't get me at least 4 new games a year, then I'm disappointed. I guess if we really stretch it with XC2: Torna, MHGU, Octopath, and Smash then we have four good new-ish quality exclusives for this year. I mean Torna is supposed to be a 100 hour long stand alone prequel, that also doubles as DLC, (and comes on it's own cart no less). Monster Hunter Generations Ultimate is technically a port, but the 3DS was no proper home for the MH series, and this has tons of Japan exclusive DLC being added to it. Then there's Poke'mon Let's Go, which I think will be a mediocre spin off game with little appeal to hardcore fans like myself. But it stands a ghost of a chance of actually being a good game, despite being a dumbed down kids version of Poke'mon. Then there's a small chance that NMH3 will get released this year. So I'll hold off on judging 2018 until all of Nintendo's eggs have hatched.

I just wanted to say 'Ya' for once. You're the only person on the Internet I know who says that and I like it :D

I wonder if they banked on Dark Souls Remastered being just that tentpole game in July. Could be, maybe, probably, probably not, maybe not, who knows. I believe this alongside Fortnite and Octopath Traveler sounded enough on paper to hit the homerun in July.

my response in the OP is actually pretty accurate