Don't get me wrong; i always played on huge maps, lots of Civs and slow speed. I say played, because i am cured now. In CIV 5 , its boring, extremely boring. More boring then ever.
That's why i said what i said. CIV 5 is boring on normal and it only gets worse, the longer the gameplay. May i ask you: what are YOU doing the first 100 turn ?
If you find 1 upt warfare challenging; good for you. To me there's hardly anything "Tactical" about it. Let alone realistic. Archers fire two hexes, while rifles don't ? Crap!
Archer fire and halt, just to wait to be butchered by what's left of the enemy's melee unit ? Crap! If you can't see it's a broken mechanic; good for you!
For me, it's broken and therefor i can't enjoy the warmongering part of CIV 5. Just because of the two examples above, the game-mechanic is broken. So i don't even montioned the AI, which was always a weak factor in all CIV's.
The other gametypes are more or less broken either; so in the end there's nothing much left to like, to me.
City-States is another "game-breaker" to me. Thought CIV was a game to make a grand empire and compete with other civilizations. Now we get "dummy-states" as a bonus, throw in a dollar or 2 and you get free food, resources and units. More funny, when you here someone of the gamedev. say they left Religion out of CIV 5 because it was too "gamey" ....lol Yeah, right, CS are more realistic

Archer fire two hexes on a world map, yeah right, that so "realistic".
They ripped the soul out of CIV, and made it more "gamey" then ever; that's a better description for the current game.