Not worth it. I absolutely despise AC and although I love Mario Kart, I don't want to lose my access to the DLC based on a 50 dolars suscription
Moreover, I don't care about Megadrive/Genesis at all and I can count with one hand the N64 games I want to play on the Switch... of which just one is on the system right now and many won't be put at all (the Pokémon Stadium games for example).
If they put GBA/GBC games I MIGHT consider getting the expansion pass. But as it is right now, is not worth it at all.