Yeah, it's a little insane right now. Players are review-bombing the shit out of Three Kingdoms, and even other Total War titles, in retaliation at CA's announcement that they're abandoning(?) the game.
To be honest, I can't really tell whether the community's reaction is justified or not (or somewhere in between). My understanding is that the base game has sold very well, but that the DLC...less so. if the latter is in fact true, then it may explain why CA made the decision that they did.
if that is indeed the case, however, then they did a piss-poor job of breaking the news to the community...and it wouldn't be the first time they've managed to face-plant in such a spectacular fashion. Regardless of how justified CA's reasons might be -- or not -- cutting off support & development to a popular, well-reviewed game only two years after its release is not a good look for them.