I get a little annoyed when someone summarizes a long explanation and then says it basically sucks. But maybe I didnt have enough bullet points.
-If I wanted a no war game, I would disable war in the custom settings right? You guys can too, if you want no war.
-If you are a smaller nation (which you almost always are) in an entire continent full of peace/same religion/friendly (ON HIGH DIFFICULTY) its almost impossible to get a cultural win unless you are geared toward it from the very start (but u have no idea which games are low/no war). So unless you have alot of luck with getting religion/ wonders/stone marble etc etc and then realize there is going to be very little war...you are golden. Ofc if you havent prepared and there was war, you could even the odds.
-the ai techs likes a beast (not fun), so even if you were the same size, they clearly and sizeably outtech you...and your only tool of evening the odds is (war!). So there goes space race, if you even want to sit through the 300 turns+ of boring, bland peace (i play on epic speed to try and enjoy the different time periods)
-the ai almost always dislikes the human player (for stupid reasons usually, like you didnt give them free tech) more than the largest ai nation, so diplomacy victory basically isnt something I have any kinda chance at (without WAR). I also do NOT want to sit around for diplo victory. O LET ME GIVE RESOURCES/TECH AWAY and spam religion on my cities incase I need to switch religions...and end my turn, and then end my turn, and then wait and end my turn...
So points victory (mostly based on size/pop), diplomatic victory, cultural victory, space race, no, no, no, and no chance.
If I have missed some major fact/strategy/excitement filled aspect here please tell me, I dont see the path to winning without at least a little war, and if they/you declare war after 200 turns of peace they WILL have an age worth of better troops- like trebs vs cannons type stuff.
Final summation: Boring and nearly impossible to win at higher difficulties (without war). Boom, nailed it.
Edit:
Ive played alot of ranked games in civ4, but One city challenge is one setting that has never held my interest. Camping, wonder, and great people whoring...is all I remember about it. I really dont know why you brought it up. Since its impossible for any civ to be "large" and you cant win culturally according to some rules, how would that have anything to do with a no war, or barely any war scenario? Maybe its too early in the morning for me.