Similar to Imperialism, Imperialism II is a game of interdependencies between economic, diplimacy, and trade. Although the real-world setting may make the game more interesting to play, it also "bootstraps" the game -- forcing it to deal with the perennial conflict between realism and playability. Proponents of realism in historical games will certainly be annoyed at some "ahistorical" outcomes and the fact that Imperialism II presents many elements in the abstract. Nonetheless, the game's excellent AI and addictive gameplay should be enough to make every strategy fan happy. You need to build a strong labor force, and recognize when your self-sufficient economy needs to expand via trade and military expansion. The New World elements are not meshed very well with the game-- it is as if the designer took the engine from Imperialism intact, and added New World exploration to it just to make the game different, without trying to assemble the interdependencies that the first game excels at. Certainly aspects such as dealing with the Natives could be better exploited and interlinked to other elements. Still, they present a nice addition to the game, and proper New World exploitation wil provide a handsome return to finance your expansion at home.
With an excellent gameplay and a better AI than Imperialism, this sequel is a must-play for all strategy fans. It was shipped with some embarrassing bugs that were fortunately fixed in a later patch (you can download the cracked patch below). While not as elegant as the first game, Imperialism II ranks as one of the best strategy games ever made. Two thumbs up!