I'm very happy with these first 6 months, much more than I was with the PS4 and XB1 in the same period (I didn't even buy either of them for over a year after they're launches).
Zelda was a fantastic launch title and I'll be replaying it once the final DLC is out for it.
I didn't love Mario Kart 8 on the Wii U, but the improvements they made in DX (true battle mode, extra boost, and holding two items) made a big difference with me and it is an amazing looking and playing game in handheld or on the TV.
Splatoon 2 is a huge amount of fun. I never played the first one. Halo 3 was probably the last multiplayer shooter I played a lot of (just got tired of them) but Splatoon is a huge amount of fun and I'm enjoying unlocking new gear and weapons.
The single player is also surprisingly fun too.
LEGO City Undercover was a game I always wanted to play, but I didn't really want it for the Wii U. The LEGO games make great handheld games and even with the chunky framerate in the open world area, it's still a lot of fun and there's a huge amount of content I still have to do.
I also got a few smaller indie games:
Slime-san is a really well made Super Meat Boy style platformer. Haven't played much of it, but it doesn't seem as ridiculously hard as SMB, and it has added mechanics that are fun (like slowing down time and passing through certain walls).
Tumbleseed is a weird game that I got since I was kinda interested in a rougelike for the system and I had some extra money in the store (and it was on sale!). Controls are very weird, but it has a surprisingly amount of depth. I'm glad they lowered the difficulty a bit, but it's still not an easy game. Haven't played much if it, but I'm sure it'll be one in pick up for a few minutes every now and then.
So yeah, overall there has been no shortage of games on the Switch. I was a bit disappointed in Arms when I played the test beta. I just didn't like how it controlled, sadly.
I can't wait for when Stardew Valley comes out for the Switch, I've waited since it first came out to play it on a portable system and it seems like it's finally close.
Mario+Rabbis looks surpringly fantastic, and I also can't wait for Mario Odyssey.
The Switch might end up having one od my favorite launch years of a system. If not ever, it definitely kicks the ass of most consoles in the last 10 years in the same time frame.