One of, if not the best city builder among not too many competitors!
Anywho, this is about as good as it gets. City builders are an acquired taste, and if you enjoy the process of painstakingly managing the inner workings of every building in your city to see it bustling with trade, every day life, and a bit of military thrown in, you will LOVE Caesar. It really sucks you in. The graphics certainly help!
The gameplay is similar to its predecessor, in that you naturally start small with somewhat simple but nevertheless important foundations. Then as the game gets more complex, you have to do a bit more to keep it going. This just is part of the pricetag of managing Rome! You have the typical areas of buildings and managing things: building housing structures, providing services (entertainment, sanitation, taxes, food, industry), trading with other provinces, and other various odds and ends. It's all quite interesting to experiment with.
Graphics are fantastic, bringing the city to life with relatively low requirements. My Pentium D 3.4ghz (stock speed) with 2gbs RAM and an x1600 pro are able to run this game on high texture, low antialiasing, bloom, and medium water effects. I'd say bloom and high texture are the two highest priorities to get the game looking its best.
Military is an afterthought, and the game's only real flaw. It's not very well designed and is there just because you can't think of Rome without thinking Roman Legion. However, it's kinda fun to see your armies training and whacking away at an enemy. The concept just isn't very well explored, and has no real depth to it.
Overall verdict: Get this game if you are a city building nut with even just a decent computer! You can't go wrong for the money, certainly.