None of those are bugs?
You telling me when I culture bomb and pump up the happiness for a city I just captured and shoot the culture up to 60% and the nearest AI city is running 20% clearly my city should go into revolt every 5-10 turns. Forget that my borders never expand beyond the fat cross.
Also when I beat the crap out of an AI and he capitulates, he still performs espionage on me, despite the fact I can't remove him from vassalage (unless I am missing something) and kick him in the teeth until he learns some respect?
Or my personal favorite is friendly/pleased with a civ who suddenly turns on me for no reason after 5000 years of peace, and its not even an aggressive civ most of the time.
WTH is the point of vassalage then? The AI needs to realize when it only has 2-4 cities left and without my help would still be stuck on musketmen while everyone is using tanks that he should thank his lucky stars I didn't wipe him off the face of the planet. Its not like I treat my vassals like crap, in most cases I can get them back up to friendly/pleased with me and they still try to sabotage/espionage/be a pain in the ass, its ********.