I don't game all too much anymore, and don't have a specific favorite, but I'll list some that I like a fair amount:
I enjoyed 'Tak and the Power of Juju' back in the day.
It was a fun, laid-back game.
'Mortal Kombat' is a classic also...
It's still fun to go to arcades and play this!
'Quake' and 'Doom' I'll joint-list as quality games.
The campaigns of both games have a great mix of jump-scares and thrills to make them worthwhile.
Additionally, I used to have a dedicated server for 'Quake' and I would play that with my friends after school.
I've always enjoyed 'Call of Duty' franchise a bit; I think maybe that's just a little adrenaline junkie coming out, though.
The other reason I have an affinity towards it is the social aspect; I love to listen to tunes and talk with friends while I play.
Only get to free up the time to play over break it seems, though.
'Pokémon' was a good chunk of my childhood.
The game is slow, but it helped get me through a lot of car rides as a kid and cure boredom.
'Ratchet and Clank' was tons of fun.
I think what made it for me was the cut-scenes and awful one-liners
Could go on more...