The skirmish and online features of the game are great but the campaign has repetition and gets boring very quickly.....
The Graphics-
This game has great graphics, it's not amazing but remember that it is one of those bird's eye view games.
The Gameplay-
Menu: There are several tabs that you can click that will take you wherever you want. Skirmish, multiplayer, options, campaign mode, and the scenario editor are a few things you can find in the menu. In the options you can adjust things like light, detail, and the other stuff that we all know is in the options :p
Gaming(Offline): If you are doing either skirmish or the campaign mode, prepare to get bored within either the first days or the first weeks. In the campaign missions, you are starting a civilization each time which takes at least a good 1 hour. You choose the difficulty on any of the modes.
Gaming(Online): The online gaming is one of the better features of the game.The good is that it is always changing and different and not always the same, also you get to experience changing your strategies while you encounter more experienced players.
The bad is that each game takes a minimum of 3 hours(in my opinion).This varies on what kind players you have on your teams.
If you have strong vs. strong prepare for a possible 6 hour game.
Weak vs. weak the game can take less than an hour.
Overall: This game is one of those games that you will get bored of and not play for a while... then a month later when your bored, you'll think about it and start playing again(This process goes on for quite a while sometimes :p)
If you have any questions, ask them.