Ok, sorry. Civ 3 is not awful. Disappointing is better. You see, as a big fan of the series (playing SMAC often, and Colonization for windows till today) I did hope CIv 3 would be so much more. But in the end its like a simplified/shallow version of the series formula. I fact, I once did read an interview where Sid stated that he wanted Civ 3 to be more simple e pretty than ever, for attracting a new generation of gamers to the franchise.
While in SMAC is deep, allowing you to play by your style, in your own pace, be it growing up slowly or fast, enfasizing or not intracity infrastructure, environmentalism, economics, diplomacy (Lal is my favorite char - its really good to have double votes for planetary governor), etc, in Civ 3 youre forced to play by only one way - expand, expand, expand untill no more room left. Otherwise youre thrashed by the computer. There are not mechanisms in the game that control this feature.
The factions of SMAC have personality, each one is really unique, and actually play by its own agenda (the Hive are "expand, expand", the University are isolationist researchers, Morganites are radical capitalists, Gaians are environmentalists, Spartans are war-minded, peacekeepers are humanitarian, etc.), an the AI gives them LIFE, thats because the diplomacy is great - you feel as dealing with another people, with another ideological values - you feel like role-playing a character. The SMAC unfolding story is ESPETACULAR - depicts the human nature beautifully, involving plausible and realistic sci-fi concepts (nanotech, AIs, biogenetics, transhumanism, singularity, transcendence, etc.) , in a phylosofical fest (you can see that Brian Reynalds really is graduated in phylosophy), making for an EPIC experience.
Technicaly also, SMAC is better in all aspects than Civ 3 - diplomacy (is more wide and realistic); combat (is more wide also with special habilities, unit workshop, more modifiers, etc.); terrain interaction (wide terraforming, real interactable 3D terrain - by raising terrain you can even trap the atmospheric masses that go from west-east, increasing rains and nutrient crops); etc.
Civ 3 IS a good game. For the first-timer it can be reeeaaly nice, but for a SMAC and Colonize veteran like me, who likes engrossing and deep experiences, Civ 3 is a "light" fun. Its like comparing Diablo to Planescape Torment. Diablo is a good game, but after you finish it, its over. Now PsT is more than a game, and when you finish it, you get an WOW, and stay with it in your head for a long time. SMAC is like this.