Half-Life 2 and the other games of the Half-Life franchise are some of my favorite games. Half-Life has always been interesting to me with its detailed storyline and unique settings. The Half-Life franchise is one of the finest out there in my opinion.
The Monster Hunter franchise has to be my absolute favorite. In Monster Hunter, you aren't just playing a simple game about hunting dragons and wyverns, you are a force dedicated to protecting the ecosystem by eliminating dangerous monsters. Monster Hunter: World specifically has introduced me to the series and has deepened my interest for the wildlife we have in the real world.
Madness Combat is a weird one for sure, but I enjoy this series for its interesting wasteland setting, cool and creative characters, and its very strange story. Its very violent and confusing, but its a great series if you know how to appreciate it and the brilliant community of talented creators it has.