Doesn't seem to be any problem with the "friendliness" feature, it looks like the AI is smart and friend most nations, but not all. So they don't end up declaring war on many fronts this result in focused war efforts.
My last game was one continent with 3 civs, the two others decided to war me, so it's not like they choose friendship stupidly, when they have better choices.
Trade diplomacy seems broken, so that is worse the way it work, but if it was unbroken it seems like an improvement.
I can't for the life of me figure out how to judge the cost changes, either archer or district stuff, it's a change, but can you actually tell a difference just playing the game?
Game performance seems way better.
So all in all the parts I have gotten to seems to be improvements, but it doesn't really fix that I've played civ longer than most people have lived and V to VI seems like a shoeshine upgrade, it's still a shoe and maybe I wanted Mackfly sneakers. I for one, is unable to enjoy the core game without at least a few game mechanics changing mods. The game difficulty system seems even more badly broken than V and it's a fighting game, without giving the AI the ability to fight.
That wasn't addressed, so at the moment I think my conclusion would be that the patch was an improvement, but it doesn't change that the shoe is still a shoe, so it doesn't make it a better game.