Yeah, I sometimes feel like this game is designed to breed xenophobia and isolationism. Almost none of the time are the other Civilizations, well, civil to you. They're just constantly whining about some perceived slight. China is in the middle of a war with Germany, so I declare war on them too? China denounces me as a Warmonger. Kongo moves a whole battery of tanks into my territory even though we're in an Alliance? They then flip the fuck out when I put one lonely AT unit just on the border of out territory.
I've been loving the hell out of this game, but I really don't feel like I ever want to interact with the other Civs. They denounce me at the drop of a hat simply for playing the game (You have more Wonders than me/You have different luxury goods than I do/You're making use of the City-State system). I think these agendas are not nearly as interesting as the devs imagined they would be. It means I never really work with the other Civs in any tangible fashion. I don't do mutually beneficial trades. I no longer try to form Alliances. I don't care if they think I'm a warmonger. Oh, you want to denounce me? Well fuck you, I'll just declare war on you then. I have to imagine this aspect of the game is going to get a huge overhaul at some point because I think it's the one area where this game still really lacks. I like the idea of Agendas, but I don't really feel like they were executed well enough to be a worthwhile addition.