A History of RPG's

Hey there everyone. I need some help from the community - I'm in the process of working on a project chronicling the history of RPG games. The highs, the lows and everything in between. I am a huge fan of RPG games and I figure there are other people who love them as well who might want to help!

Anyway, what would you call the corner stone, ground breaking games that defined (or redefined) RPG's as a genre? What would you consider to be the failures? What would you considered the best and/or the worst?

Feel free to just a bunch of games or pick out a few and give some insight into what you think about the game. For me personally, when I got my first Nintendo, my parents signed up for a Nintendo Power subscription and with it came a copy of Dragon Warrior. That game was a major stand out for me. It brought something new to games that I had never experienced before. Progress, choice, gear, stats etc etc. I played the hell out of that game. What about you guys?