Seeing all the discussions, I have to ask: is it only me or since the NFP the AI got better?
<...> Here, same games we play as usual, and suddenly Philip II had sent a colony on Mars? Is it me or the AI had become way better in the last expansion (at least for casual gamers)?
They improved some tactical aspects, for example now, if you put your unit in range of multiple hostile cities/encampments, they will all shoot you. Ranged units will also shoot. Even AI fighters can now attack aground targets. And if you take your game well past t300, AI may get a lucky break and win. As far as I remember, pre-expansion vanilla AI used to beeline much more aggressively and could win pre-t300 more often. But if you focus just a little bit, AI has no hope even on Deity.
Also, Civ IV has way too many problems: religions have no difference whatsoever, making the choice of any of them really pointless;
Religion in Civ IV has more political impact than in both Civ V and VI combined. While it may not be such a bountiful store for bonus-shopping as in V and VI, it is the first great divider of civs into rival political camps.
The impact of the overall situation is considerable: will most of civs fall within one religion and will have a happy tech trading peacful time, making you sweat in trying to catch up with them, or will they fall apart into a few powerful camps, and you will be left before a very difficult choice when a couple of yout neighbours come asking to convert to their religion, and you know that if you refuse one of them, the rejected party will very likely come back with an army which may be bigger than yours.
Having state religion and organized religion boosts your production of buildings. Being in Apostolic Palace religion adds production to repective religious buildings.
It is simple, yet very elegant system, offering sometimes very difficult choices, and not overloading you with a ton of tedious micro.
the squared grid is tedious especially when you discovered the hexed grid from V and VI
Matter of taste, discussed to the death. Squares do give more movement freedom - 8 directions, hexes only 6.
They're... not? I honestly fail to see how they are broken. AI handles hexes and 1UPT considerably worse.
you can loose a walled city to a scout if you have no army in it (I don't know for you, but cities were able to defend themselves through milicia even without armies in it, it's the point of sieges)
Keep a cheap garrison unit then as militia or leave it undefended at your own risk. V and VI giving guaranteed garrisons everywhere are further from reality, I guess.
when founding a new city, you have no way to help it develop quickly (no buying buildings except you took Universa Suffrage, no trades routes to help you gain some hammers or food) meaning that expansion in the mid-late game is awfully tedious...
Using the title of the Civ IV meme thread, 'Do you even whip, bro?'
There is a way, it is called slavery and pop whipping, i. e. converting food to production. That's the fastest way to build up your new city (so food is king, so you need spots with lots of food, so map does have some importance, doesn't it?). And late game you have sufficiently powerful tile improvements to build up your city, or yes go universal suffrage and buy, if you so wish.