>>8493704Civ5 took away faith victories and it was kind of disappointing. But all-in-all, it's my favorite entry in the series. None of the Civs seem "bad" per say but there's certainly really broken ones.
As for Civ6, I can't tell you too much about it because I haven't played it a lot. It's pretty streamlined and simple compared to the older games but to make up for it, it improves upon a lot of the automation in the game. Your turns can fly by faster but you have less control in the long run.