After many happy years of playing Civ IV, I thought it would be fun to go back to grassroots and try Civ I (mainly because I missed the delight of building my palace...) which I first played back in 1990 when it was released. I cranked it up on DOSBox at around 6pm one evening after work, and before I knew it, it was 1am. That's the thing with original Civ: it's just plain addictive. And frustrating, too! The AI is so utterly backstabbing and treacherous, that when you try to play as a peacemonger it is virtually impossible. Rogue AI phalanx units that come and squat outside your city, forcing you to declare war, but then the moment you take a city they beg for peace... then sneak attack you 3 turns later! It's all part of the fun.
It's the quirks and idiosyncracies as much as anything else which keep me interested in Civ I. I still think Civ IV is the best so far (not tried V yet) and have a lot of affection for CTP (which I know a lot of people hate, but I think it's cool). But Civ I doesn't age (well, the graphics do, but I'm fond of them in a nostalgic way). It's still so very playable!
Plus the hilarious but frustrating "Trireme beats Ironclad" shenanigans...