5 games that define me: hmmmmmmm
I guess I'd have to go with these:
1. Halo CE / Halo 2 (Xbox)
Although I'd been playing games for years, Halo was the first game that I ever played that involved playing with other people (other than the occasional game against my brother). Halo got me into the FPS genre and was the game that actually made me buy my first game console - all others had been gifts or owned by someone else - so that's why it has to be number one. Halo 2 also deserves mention because it got me into online gaming. I remember getting DSL internet right after the Xbox 360 came out and since there were no other good FPS's at the time on the 360, Halo 2 was my online game until late 2006 when FEAR and Gears of War came out, so Halo 2 was retired. To this day, I still play Gears and Call of Duty regularly because Halo got me into the multiplayer shooters. I played Halo 3, ODST, and Reach, and they were fun, but they never hit the sweet spot that Halo 1 and 2 did in my opinion.
2. Super Metroid (SNES)
As stated above, I played games for years, but they were always gifts or games no one else wanted and so they were given to me. However, Super Metroid was the first game I actually remember wanting specifically, and it turned out to be one of my favorite games ever. If I still had a SNES, I'd still play it. The art, gameplay, and bosses made me keep coming back for more, and it was the first game I ever strived for 100% completion and succeeded. To this day, this is the only game on consoles older than the Xbox/PS2/Gamecube that I still remember that fondly and truly sparked something in me that made video games more than just something to do after school.
3. Fallout 3 / Fallout: New Vegas (Xbox 360)
The two games I've spent the most time with other than online shooters, the two current gen Fallout games are two of my favorite games ever, and are the only two current gen games that I constantly revisit long after I've beaten them. The gameplay is great, the game world is dark and absorbing, and it really makes you think about the direction the world is going - could something similar happen to us if missiles start firing? Also, this games karma system is the first light/dark moral system I'd played aside from KOTOR that seems to have major implications on the way the world evolves around you (althought NV is more about reputation than karma). Also, I remember anxiously waiting for Fallout 3 to be released (seriously, I've never been that excited for a game, and I've never been since) and when it was, I skipped two days of college classes and played until I dropped. The weapons, character choices, and environment all make for one of the best gaming experiences I've ever had, and now I'm thinking about booting up Fallout 3 again!
4. KOTOR / KOTOR 2 (Xbox)
As a longtime sci-fi fan, Star Wars was never one of my favorites, and when I got KOTOR for Christmas one year as a Platinum Hit, I wasn't convinced about a Star Wars RPG. Two playthroughs later (light and dark) proved me wrong. The story and process of following your destiny, earning your lightsaber and powers, and discovering your real identity (no spoilers) made KOTOR my favorite RPG of that time. KOTOR 2 only expanded on what KOTOR did and gave even more options, and although the story wasn't as great, I actually prefer it to KOTOR 1. The storytelling really got me interested in Bioware's games, and now I've played Dragon Age and Mass Effect as well. Still, KOTOR gets the nod for getting me into story based games, and along with Halo 1 and 2, KOTOR 1 and 2 are the only original Xbox games I still have.
5. Minecraft / DayZ (PC)
Although these are seemingly two completely different games, they do have a few things in common that I really admire. First, they are proof that a little smarts and creativity can make something amazing and unique. Before these two games were released, there had never been anything quite like them, and the fact that both exploded in popularity proves that doing something never done before can work. Second, they are both going about a similar release system (Minecraft and DayZ standalone) in that you pay less for an unfinished but playable version, help play and test the game and its new content, and fund further production in the process. This system could become much more prevelant in the future in my opinion. Third, both are completely storyless and rely 100% on the player to define the game. While other games allow you to play it your way, nothing gives you quite as much freedom to do what you want as these two games do. Seriously, watch youtube LP's of these two games and see just how different and absorbing they can be. Players adding a good narration or story to these games in their LP's makes for experiences like nothing ever seen, and I hope that developers see this and realize that this kind of freedom is what many people want. Merging this with great gameplay and existing formulas will be the future of gaming, and that's why both of these deserve a mention for the path they are taking.
Honorable Mentions
Pokemon series: grew up with these, and enjoyed them a lot
Half-Life 2: Great seemless merging of story and gameplay, and still a favorite
Valve - PLEASE GIVE US HALF LIFE 3 OR EPISDOE 3 SOON. PLEEEEEAAAAASE!!
Metro 2033: Amazing atmosphere and story - truly felt like I was in a doomed Moscow. Also taught me to keep my eye open for "under-the-radar" games
Gears of War / Call of Duty series: some of the best multiplayer ever and two of my personal favorites - they just didn't define or change me the way Halo did