My wife played Pokemon and Mario Kart before we dated. After dating for a bit she took a bit of interest in what I was playing and even started playing some games on her own.

My wife liked watching:

• Witcher 3
• Red Dead Redemption
• Assassin's Creed (pre-Origins style games)
• Portal
• Devil May Cry (besides DmC)
• Prototype
• Xenoblade Chronicles
• L.A. Noire
• Spiderman

She joined me or played some others on her own:

• Stardew Valley
• Rust (surprisingly)
• Conan Exiles
• Golf with Friends
• Animal Crossing
• Dinkum
• Core Keeper
• Terraria
• Truck Simulator
• Ori and the Blind Forest
• Assassin's Creed Black Flag (she liked to gather supplies and do small secondary quests, or just sail around)

The all-time winner was Breath of the Wild, she loved to watch and play it, and sometimes I watched her play it too. She solved problems in very different ways than I did and it was interesting. Example: my primary way to kill Guardians was to deflect blasts, while she just rode her horse at them and cut them apart. You can imagine how nuts Tears of the Kingdom has been lol.

I feel it might be worth mentioning she did not enjoy watching or playing:

• Monster Hunter
• Any flight/space sims (Ace Combat, Elite Dangerous, etc.)
• Factorio
• Minecraft
• Remnant
• Deep Rock Galactic
• Vermintide/Darktide
• most Metroidvanias
• Civilization

If I had to guess at what these share in common, its a lack of story and NPC interactions, or pacing that makes it less interesting to watch.