In the sense that the game functions without technical errors. Although I think the editor froze my computer..
However, I'm not sure the game is working correctly when the enemies' units (Sans roaming tribes who are almost no threat against an equal or greater force) win consistently even though the statistics favor me. I do not appreciate two Warriors defeating an Archer and Spearman (And the Archer got to attack.) I know it was just Halloween, but I didn't care to witness the Egyptian War Chariot That Would Not Die. And I feel guilty for all the lives I've lost attacking enemy cities.
"Ha! I've got them outnumbered, outgunned, and outmaneuvered! There's no way I'll lose this fight! I- huh? Oh God.."
Another thing that bugs me. Does anyone else get the feeling that the AI acts as a single entity? Although it will pit the computer players against each other, when they come up against me it seems all too willing to unite them on a whim.
All of this on Chieftain Level, too.
Note to developers (Not just Firaxis, this is universal):
If the AI needs cheats in order to institute [artificial] difficulty,
you did something wrong.
If the AI is ridiculously hard to a veteran on a setting that is supposed to be introductory, you dropped the ball. In the sewer. And got stuck trying to get it out. And had an Alligator eat it. And you. And then your house burned down. And then..
And don't even get me started on the crappy starting positions and crucial resources that have an aversion to appearing near my civilizations..