I started playing Railroad Tyccon back in 1990 when I was 4 yeas old.
My first Civ experience was in 1993, when I was 7 year old. I remember having a high-score of 153% that year (I always played on emperor).
One year later, when I was 8, I got my hands on a pre-ordered copy of Colonization. It was probably my favourite game at that time. The game also made me really interested in indian tribes and american history. I didn't understand the game mechanics good enough back then and never passed the 100% barrier, even though I successfully declared independence on Viceroy several times.
A few years later, Civ II came, and I played it like a maniac until I completely broke the game with about 600-700% .
I then got AC from my brother as a christmas present. I loved the unit editor, but after a few playthroughs, the game became a bit to repetive and easy. I also hated the fact that the best armor in the game was so ugly.
I was really excited when Civ III came out, but I never enjoyed that game as much as I did with Civ II. I think it was the corruption system that ruined a lot for me. If you placed an early city on or two tiles to far away, you could lose one or two shields, which could be really frustrating. But at the same time, the key to success was to occupy as much land as possible as quickly as possible. This got improved in expansions, but somehow I felt that too little thought had been put in by the developers. I also felt that the hardest difficulty level was too luck based.
When Civ IV came out, I much admit that I first was disappointed. I thought that there were to few units to build and too much enter pressing. But I also discovered that the game mechanics had been greatly improved. I never missed the offensive and defensive values and I never missed the old corruption system. Civ IV made it possible to have a small and effictive nation, but it didn't prevent you from conquering the planet. It became even better with the expansions and I still come up with new strategies on how to play the game.
I've never been so excited about a computer game as I was when I heard that Civ:Col would came out. I bought it on release day, turned of my mobile phone and began to play. However, after a few hours of initial excitement, I began to realise that something was wrong. I wasn't having fun. The indians felt wrong. In the old game, I usually befriended them and got their help thru-out the entire game. But now the just felt like irritating obstacles. I didn't care about producing any goods, instead I just sold muskets to indians on other islands. My universities got worthless after educating a few specialists. It felt like the entire game was about beating game mechanics and that it didn't really matter whether or not I could get my empire working. I stopped playing and installed the old version again, and to my big surprise, I had a lot more fun.
Finally I got Civ V, though I don't consider it a Civ game. It's a tactical war game with some Civ-element present, but it's obvious that their goal wasn't to satisfy oldtimers like myself. At first I was bitter, but now I realise that Civ IV and Colonization are still great games that will keep me entertained for years.