Yes there are a lot of great games. But if you play only the amazing games that come along nowadays, you'll be missing out on a multitude of older games that are incredibly fun and that are a part of video game history. So put down your hi-def TVs (if you're that strong), prepare to blow on you Super Nintendo and watch from an isometric perspective.
1. Fallout 1 & 2: You think that God of War was violent? You think that Oblivion gave you too much freedom? Well, these two gems are here to blow your mind. These games were made a century ago, yet I don't really believe they've been topped. I mean, when was the last time you blew a huge chunk out of someone torsos, revealing splintered ribs and glistening guts? Okay so it's not that clear, but it's still a really gruesome game. And you think that GTA invented the sandbox game? In Fallout you can literally take wathever path you want to and do whatever you want to. Okay so there's a certain order that you have to visit certain towns and what-not but it's still pretty damn open-ended. You can be the gun-totting warrior that does that aforementioned blowing off of limbs. Or you can be the charismatic thief with the thugs that do the bone crunching for him. You can be the sly assassin. The peaceful diplomat. You can even be a woman. It's crazy. The moral choices you have to make would make Knights of the Old Republic blush. You can kill everyone in your sight or you can give the populace a helping hand. You can be a pimp, a drug dealer, or you can find a cure for drug addiction. It just boggles the mind. With Fallout 3 coming out soon, you might as well play through these amazing experiences.
2. GTA III: One of the most famous games ever made. Play it. It's still a lot of fun. Trust me, it's just as fun as its sequels. You'll miss some things (a non-broken targeting system if you're not playing it on the PC like you should), motorcycles, non-blocky characters. Pros outweight the cons though. Fun, freedom, hilarity, and a much better knowladge of Liberty City's alleys for when GTA VI comes out.
3. System Shock 2: An underapreciated game. It's crazy good. It's like a less pretty Bioshock. There's incredible freedom, amazing storytelling, innovative gameplay. Graphics are not what they used to be and it's no longer as scary after having played Resident Evil 4 and Silent Hill 4, but it's still a truly great game.
4. Mortal Kombat: Remember when the Mortal Kombat games were amazing? No? Well, then you have to play MK. The one that started it all is just as bloody, incredibly hard, and smooth as you remember it. The gameplay is still razor sharp. The greatest 2D fighter ever made deserves your attention.
5. Dune: That game that basically started the RTS genre is ugly, but alot of fun. By really pushing you to use actualy tactics instead of just massing unis, this game will take you to your limit. Antiquated, but a must play.