1- As a kid i spent a ton of time with Combat and Yar's Revenge for the Atari 2600 and Mega Man 2 on the NES (really showing my age here). I missed out on a number of systems until the PlayStation. With that i was introduced to the world of Gran Turismo and I've meet hooked ever since, i've spent more money and more time on this franchise that any other and i am anxiously awaiting GT Sport to release. Then my first JRPG, Legend of Dragoon, this game . . . THIS GAME! It opened my eyes to a whole new world of writing and design, i played this game 5 times and i still have it! i cant wait to introduce it to my kids. I suppose this answers number 2 as well. Much later i was introduced to the world of Final Fantasy with FF10. I binged on this game, me and my friend double teamed it, he would progress the story and i would level him up. By the end of the game the skill trees were so intertwined every character had bits of every other characters skill tree. I loved the Assassins Creed franchise until they left the Desmond story arch, I'm a little salty about how they ended that . . . except Black Flag, i played the hell out of that game! Presently i am playing and loving Destiny, managing our my Clan which coincides with our ExtraLife team (see Destiny Clans:: We are Team GG). With 3 kids and a wife competing for TV time, i don't get to experience the content drought that a lot of other gamers experience.
2- See above
Bonus: Gran Tursimo, It taught me that you can always improve, set the bar higher. That little tweaks can make a big difference. It also helped spark my interest in cars, it helped educate me on other makes and models of cars and exposed me to a world of racing outside of NASCAR (which sucks) that the vast majority of Americans are sadly unaware of but are gradually becoming educated on.