1. Final Fantasy 7 = This was my first RPG. Since playing it, I've played plenty of them. I'd like to know what I'd think of the game now had I never played it, knowing what the genre's capable of.
2. Zelda: Link's Awakening = This is my favorite Zelda game, but admittedly one of the first ones I played. I'd like to see what I'd think of it now if it were brand new to me and I didn't know how to approach every dungeon/task.
3. Guitar Hero = When this game first came out, I instantly fell in love with it. I am both a musician and a gamer and knew I'd fall in love with it the moment I heard about it. Nowadays, the game bores me. When I bought one game and instantly got 5 stars on all songs on Expert, I felt like the genre didn't have much to offer me anymore. I'd love to go back and be a newb again. Plus...the original guitars were definitely the best because of the response.
Nothing from this gen based on the fact that I haven't replayed any of them anywhere near as much as I have with these games. If I had to pick anything from this gen I would say BioShock 1, BioShock Infinite, Mass Effect 1, or MGS4.