I agree with a lot of what's been posted. Xeno, the FF's, so many classics. Baldur's Gate 2 probably heads my list because I believe no game has ever created such interesting and dynamic characters, the pc-npc interaction and npc-npc interaction was off the chart.
I'll share a story a little off the board about NHL 2004, the single greatest video game event ever, or top 5 at least
My friends and I play Co-op where we each lock a position. So I lock to left wing, my other friends lock center, right wing, left and right defense respectively. We played all 82 games that year over the course of 5 months and went 81 wins, 1 loss. We don't reset ever or quit out of games, if we win, we win, if we lose we lose.
The playoffs came around and we stomped through the first 2 rounds as expected 4-0 each series. When we got to the conference finals we were up 3-0 and into game 4 and somehow we lost. Only the second time since we bought the game. Then we lost again and again. The series was tied 3-3 and it was around 2:30am. We were stunned. Well, we took 10 and then got back in front of the PS2 and hunkered down to play the 7th and deciding game. We started well and built up a 4-1 lead going into the 3rd period. And that's when we got "video-gamed" as I call it. As the 3rd period is winding down, suddenly you can't check the computer off the puck, or poke check or stop it in any way. It just gets to score. The computer scored the tying 4th goal with under 1 minute left and we barely got into overtime as it hit a post with seconds remainng.
The 5 of us just sort of stared at each other in stunned silence as we watched what was our 6th month of playing this game together wind up in overtime in the playoffs. We had played every game, and not pussing out when we lost a game in the season or playoffs, not playing on 5 minute periods with no offsides or penalties or any bullshit. Real hockey for 6 months on our weekends when the girlfriends would forget about us and our pizza 73 account could have another $50 order added to it(and no mr.operator we don't want to know how much money we've spent on pizza in the last 6 months thank you). It still gives me goosebumps thinking about this, but when we finally decided to click 'resume' and start the overtime, everything was riding on it. Every minute felt like an hour, and a desire to backcheck your ass off, cringing at every shot the computer took, wondering if that shot was the last.
With about 5 minutes left in the first overtime I was able to skate down the left wing, make a little move to beat the defenceman, but he managed to knock me off the puck. I skated into the corner for the puck, around the net and passed it across the crease so my friend chuck playing center could tap it in for the winning goal.
We went fucking nuts. I threw my controller and jumped off my seat onto the couch where chuck and one of the other guys were sitting and the other two guys piled on yelling as well. It was pure joy and I think we actually woke one of the neighbours up because we yelled so loud when we scored. We were celebrating like we were out on the rink instead of in a buddies basement at 3:30 in the morning. It was so amazing, few video game experiances have ever been like this, man it was awesome. To this day, we play NHL08 when we can. Some guys are married to their girlfriends now, some engaged; most living in different homes, but we all still laugh about "that one game" that got us so worked up we became kids again for a few minutes.