I have to say, the Halo series is my favorite, hands down. First game I ever owned was Halo: Combat Evolved.

I prefer multiplayer over campaigns and such, although it may just be the kind of person that I am. I'll play through it for the achievements, then I'm done. Same with books, I can never buy a book because no matter how much I love it, reading it twice isn't an option. I just play through the whole book in my head as soon as I start reading and ruin the experience for myself. I guess you could say I'm always looking for a new thrill.

TF2 is a pain in the butt to learn. I personally don't like the controls much, specifically, switching your weapon. The scroll thingy would have been fine if you didn't have to click afterwards, but I always forget to click. I would much rather prefer something like Minecraft's scroll to choose or how you can choose a number 1-9 and it will choose the corresponding item on your hotbar.

Thanks for the tips by the way, I just recently got destroyed in a game, but I did better than before went something like 6 and 15. >.< I swear I'll do better one day.