The oldest game I've ever played, and also one of the best.
This said, I recently decided that I was going to break through that trend and play through some PC classics. Half Life was the first game that came to mind, so I downloaded it off Steam, and began playing. Looking back, this is probably one of the best decisions I've ever made.
Now, going into this I wasn't expecting to actually really enjoy myself. I was playing the game simply because I knew it was a classic and thought that if I were to truly call myself a PC gamer, I had to at least play Half Life. How wrong I was. Not only did I thoroughly enjoy my week spent with this game, but I've learned never to underestimate any game again, regardless of its age. The whole time I was playing Half Life, I was constantly thinking to myself: "Wow, this came out twelve years ago?" Which is what really surprised me. Even though this game was made before the twenty-first century came around, it is still perfectly able to hold its own amongst almost any new title in terms of gameplay. Even today, this game can be seen as being innovative, which, considering its decade-old age, is astonishing.
From its long, immersive story (something rarely seen in FPSs these days, if at all), to its addicting gameplay (which seemed very much ahead of its time), Half Life comes together into a game that every single PC gamer out there should experience. It has changed my gaming mentality completely and I have learned that newer does not always equal better. The only reason I did not give this game a 10 is because, to be perfectly honest, by today's standards, this isn't a "perfect" game. That said, the fact that I, someone who has only ever enjoyed playing the most recent titles, has rated this game a 9.5, should speak volumes to its greatness, and I can guarantee that, had I played Half Life twelve years ago, I would have given it a perfect 10/10.