I think (I mean I don't exactly remember) I first played civ 1 around 92, first from a not too legal copy but after some time I thought, hey, this game rocks, the guys who made this game should earn a decent living, so I bought the game. Legal and stuff.
This is in general my advice: you test the trial junk version 1, just like anyone else. Normally, you ditch this then to let the competition debug it, and you get it yourself somewhere around version 4.
Civ is the exception. It rocks from version 1!