Bibor
Doomsday Machine
I just played an ICS, inspired by the numerous posts here and I came to conclusion that the ICS gameplay style was deliberately chosen by designers as one of the ways to create your empire.
Let me elaborate.
Policies
Some policies seem weaker when compared to other policies. In my opinion this is because they are tuned for a really large number of cities. The Commerce tree, the Liberty tree, Primary Freedom (specialist unhappiness halved) bring benefits that are "meh" for a small empire, but really add up for a large one. One good example would be the "roads cost 20% less" which is a 10-gold discount for an empire with 7 cities, but can save up to 50 gold for an ICS empire.
Wonders
Honestly, some wonders don't seem to cut it for a small or medium empire. Big Ben? Who has enough money to rushbuy anything? Even with a superb economy, your money surplus is not going to be that big to afford rushbuys very often. Machu Picchu is similar in effect. While for a 7-city empire it might generate a few dozen gold, for an ICS empire it will generate 200 or more gold. Status (lol @ PDF manual typos) of Liberty won't do you much good for a small empire because generally your cities are big and spead out and you want them to work tiles not specialist slots. Again, for a large empire it can mean over a 100 hammers. I might even add Pyramids to this category, because the number of hexes to be worked does matter. Similar thoughts are on Forbidden palace.
Tech pace
A smaller empire relies on its own large cities for reseach, as well as reseach agreements. Larger empires rely on large population (and less multipliers) for research. Compared to my previous experiences, research rate with a large empire is double of that of a smaller one. But add 3 research agreeements per a 30-turn period and it quickly evens out.
Culture
Although you can rushbuy everything with an ICS, culture generation comes out even, slightly in favor of medium empires, much in favor for small empires. ICS does presume you rushbuy temples, monuments and such, while normal empire approach presumes you build them and save money for research agreements.
In conclusion, this game enables you to make an empire from one city to several dozen cities and you can win with all possible combinations of city numbers, each way having its own merits and negative aspects.
Let me elaborate.
Policies
Some policies seem weaker when compared to other policies. In my opinion this is because they are tuned for a really large number of cities. The Commerce tree, the Liberty tree, Primary Freedom (specialist unhappiness halved) bring benefits that are "meh" for a small empire, but really add up for a large one. One good example would be the "roads cost 20% less" which is a 10-gold discount for an empire with 7 cities, but can save up to 50 gold for an ICS empire.
Wonders
Honestly, some wonders don't seem to cut it for a small or medium empire. Big Ben? Who has enough money to rushbuy anything? Even with a superb economy, your money surplus is not going to be that big to afford rushbuys very often. Machu Picchu is similar in effect. While for a 7-city empire it might generate a few dozen gold, for an ICS empire it will generate 200 or more gold. Status (lol @ PDF manual typos) of Liberty won't do you much good for a small empire because generally your cities are big and spead out and you want them to work tiles not specialist slots. Again, for a large empire it can mean over a 100 hammers. I might even add Pyramids to this category, because the number of hexes to be worked does matter. Similar thoughts are on Forbidden palace.
Tech pace
A smaller empire relies on its own large cities for reseach, as well as reseach agreements. Larger empires rely on large population (and less multipliers) for research. Compared to my previous experiences, research rate with a large empire is double of that of a smaller one. But add 3 research agreeements per a 30-turn period and it quickly evens out.
Culture
Although you can rushbuy everything with an ICS, culture generation comes out even, slightly in favor of medium empires, much in favor for small empires. ICS does presume you rushbuy temples, monuments and such, while normal empire approach presumes you build them and save money for research agreements.
In conclusion, this game enables you to make an empire from one city to several dozen cities and you can win with all possible combinations of city numbers, each way having its own merits and negative aspects.