Strategic ressources in Civ4 were less rare and the bone of the game was different: at the end there was no more empty land, and as you would have up to have this land anyway, it was not a hit. Now with unhappiness growing, founding a city solely for iron, far of your capital, is a hit... when you find any.
I wouldn't mind at all to see dominating civilizations as far as the game system allows it: now if you're conquered, you lose, period, nothing more happens. I wouldn't mind to see dominating civs if the fact we lose a war wouldn't hurt the game so badly. (= Game Over)
There was no strategic ressources in Civ1 and 2, and i don't remind that the game was that different or less fun to play. (on contrary)