My favorite would definitely have to be RPG. I've been into this video game genre ever since I was five, when I first played Legend of Zelda: Oracle of Ages. The game was very addictive. Day after I got it, I ended up playing it for seven hours straight—from nine in the morning (immediately after breakfast), to four in the afternoon. I was called for lunch somewhere around twelve, but I still didn't stop playing it; I ate with one hand and played with the other. xD
I like shooter, too. From this genre, Call of Duty has gotta be my most favorite game. When I first introduced to it, I was quite horrible. I was able to get only one kill after, like, five or six deaths. Eventually, my skills began to improve, and I started to become better. Nowadays, I don't die as much anymore. I'm able to get ten to twelve of my opponents killed before they even get the chance to shoot me. The only thing that causes me to die is server lag. Almost every time I'm in a match, the server starts to lag me, making my player stuck on one position for eight - nine seconds. This leaves me completely open to the enemies, and makes it easier for them to kill me.
I'm an action-adventure fan as well. I have a ton of favorite games from this particular genre, and two of them has gotta be Legend of Zelda: Skyward Sword and Assassin's Creed II. In Skyward Sword, you face a lot of challenges, do a bunch of missions, and are required to solve puzzles to get to other locations. AC II is the same, but the story is more realistic. Plus, it included some mature content, such as nudity and blood.