With the appearance of the 8bit computers(Atari,Amiga etc) back in the 80s, it marked the birth of games industry era as we know it today. Suddenly you had a system whereby 3rd party companies and individuals alike could write programs and games to be used by millions. Many classics games suddenly sprung onto a virgin audience with a taste for 'behind the TV' virtual interactive entertainment. This era was IMO the start of what we are playing today.
For people like myself, who where aged between 15-25 probably had the best out of that era and forged many livelong memories with some of our own personal favorites. Never before had our minds and senses experienced this kind of virtual interactive world before. A game could grab you in such a way it would leave a lasting impression with you.
Then even more people were pulled into interactive game world with the birth of the Home PC(Amstrad, Dell, Gateway etc). A person could now own a PC with more power then the computers they used to send a rocket to the moon and this power gave the games industry another major boost. Many games were ported over from the earlier consoles and 8bit computers but many new games were created too. One of the biggest advantaged that PCs had over the earlier 8bit was networking and soon after, internet access, this was proven with the arrival of Doom. Many of us will probably never forgot our first LAN experience with Doom (or other LAN games) and also it was one of the first games of that type that was made available as a free downloadable demo from the internet, I remember playing 4 player lan demo with my friend and never before have I laughed and shouting with them so much. Because of that, I bought the game when it eventually came out. Then a few years later, the birth of MMOrpgs, which pulled again, new and old gamers alike back into a new type of gaming world.
Many great titles were made both in the 8bit and early PC era, but that is exactly my point. We have been spoiled, our experiences from past games are so great and our memories of them are so fond, that most games nowadays, eventhough they are 100x time better in graphics, sound and complexity, they could, in our own opinion, never beat our first experience with a game/games that really grabed us. We still keep playing new games, and some of the time we may even go 'WOW thats amazing' for a while, but in the long run, most of us 'veteran' gamers will probably never feel that same as the first time.
Like with all things in live, you always remember your first time... and I hope she does too
PS The greatest game to me would have to be 'Alternate Reality' Atari 8bit version. It was way ahead of its time and if they ever make that into a MMO's, it will probably be made by Carlsberg. I spend about 2 years of my live playing this game and was still discovering new places, encounters and items after 18 months of playing it, amazing. A close second would have to be my first proper MMOrpg experience, Asherons Call, the biggest joy I got out of that was cause I could play online with RL friends and have great laughs/talks about it afterwards with them. Those were them days.