As good as some of the 'series' games are, like Pro Evolution Soccer (let's face it, that is the game - whichever version - that brought all of us here originally), they are definitely 9 months to a year's worth of gaming. Towards the release date of the next instalment, we are all gagging for the new game.
I just can't put a game that has a very definite lifespan into my top games ever list, as good as they were. I mean, imagine Konami said, "Right, that's it. There will be no PES 2011. The next one will be 2012." Can you see yourself in a year's time still going at PES 2010 happily, knowing that you've got another year to wait? Maybe you can - maybe it's a mentality thing, knowing there's a new one coming out that heightens anticipation. But I'll tell you this - once PES6 came out (the last one I owned), I didn't ever have a craving to play PES2, for example.
I still get cravings, from time to time, to play CM 97/98. I have owned every single one since then, almost. But there's something about "he goes past one...and he goes past another...he's only got one to beat...GOAL FOR INSERT TEAM NAME HERE!!" that still gets me. Memories like that define games for me. The fact that I still have that memory says it all.
In a similar vein (in terms of vividness of memory for a game), I have to mention Civilization II. When I first bought the game, I spent ages trying to kill a buffalo. Ages. I just did not get the game. No-one had told me about it. My mate had dropped it round on a CD and told me to play it. So I did. It took me about 10 minutes to install the game. I spent another 10 minutes or so trying to work out what the game was about. I then spent the next hour trying to kill a buffalo.
Eventually, I built a city. Then I harvested the buffalo and turned it into food. Bingo. I was hooked. In a moment. This game was amazingly easy to mod, as well. As was CM 97/98. Me and a friend re-designed Civ II to the point where we gave it another year of playability at least.
In the same way, CM 97/98 allowed you to edit the commentary text. At the time, this made the game so much more unpredictable (my mate did my copy, I did his. Not knowing 4-5 sentences before something's going to happen that it's going to happen is phenomenal after you've learnt the sequences off by heart!). In about June 2000, my database was up to date. And yes, I did own 98/99. And 1999/00. It mattered not.
I feel sorry for people who's earliest console memories are these next-gen ones. Although I guess in 10 years they'll probably look back at them in the same way I look back on games whose 'engines' were largely made up .txt and .jpg files.
The entire game engine of Civ II was contained in a single .txt file. It was phenomenal. The whole technology tree, all the unit attributes, special attributes, resource information - everything.
It also introduced me, properly, to multiplayer gaming that wasn't an FPS or a racing game. Me and two mates used to play 'hotseat' games of Civ II. On a world map that one of my friends built using the in-built editor and an Atlas. We historically placed the starting locations. We named the cities of both us and the AI. We drew the units in MS Paint, one pixel at a time. It was our game.
Generic, once-a-year data update on the same game engine can never compete with this. And I reckon I'll stand by that same point of view in 10 years.