Great game now that they have most of the bugs out.
I love the Civ games that is why i bought it so blindly. The latest patch seems to finally fix it, somewhat. Civ IV still crashes, but i can play for hours and hours before it does, and sometimes it doesn't :) Now i'm finally enjoying the game, 3 months after it came out. They should have perfected their beta version of the game instead of releasing it.
Now that i'm through griping, I love the game. If you love the civ games this is another great one. Not much changes, the religion is a fun thing to play with but once you get to the late middle ages and go to free religion it doesn't matter at all. Not much i can add to the other reviews just wanted to get my grip in.
And the only nuke i saw was the ICBM, i miss being able to put a tactical nuke and a nuclear sub. Also, they only put one sub type in the game. There should be a conventional and nuclear powered sub, like in Civ III.
And the learning curve is for someone new to Civ. If you know Civ 5 min.