Well I have nearly completed a domination victory as Arabia (renamed to Iran, led by Ahmadinejad). I built the Statue of Liberty in Bahgdad for fun, totally conqered the Americas, 80% of Asia, 50% of Africa, and 90% of Europe. This is on Warlord difficulty. Mostly I am only continuing to play just so I can see all the military units in action.
I wish there were more diplomacy options in the game (yeah yeah).
It seems that there should be a way to prevent the whole spearmen vs tanks debacle from even occuring (I'm not talking about tanks losing to spearmen, I'm talking about tanks fighting spearmen in the first place). I know I am only on warlord difficulty but when India still has swordsmen and I am rolling across the continent in my tanks/artillery/infantry wall of death something is just out of place.
I'm thinking that you should be only allowed to tech up so far in a technology branch before each additional research starts giving free technologies to the other civs. This would actually be more realistic. Look at todays world where America has Tanks/Satellites/Drones/Nukes/ Etc and is stuck fighting in the Middle East.
The terrorists there aren't using spears and while they might not have tanks/drones/satellites they do have modern small arms (rifles, grenades, RPGs) and make good use of other technologies (computers, cell-phones, etc). None of that tech was ever really developed by them, but it was impossible to keep it out of their hands.
Also, city-states should be able to leech some of this from you as well, I'm not sure how city-states work mechanically, but it seems wierd they "gift" me artillery and infantry units when they still have spearmen in the 1950s.
City-states also aren't agressive enough. I was allied with Sidon the whole game, at first I was pleased when it helped me attack the Ottomans (which were right next to it). Afterwards it did NOTHING the entire game aside from grant me a few random units. Even when India declared war on it...it did nothing. It didn't even make more crappy spearmen, it just sat there. Luckily India couldn't get to it because I was in the way.