Bwee. This be similar to the grand strategy titles made by Paradox, except it is set in the present day and has no real time limit. Like those Paradox games, you can pick any country you choose and you more or less choose your own objectives. Unlike the Paradox games however, SP2 is chiefly a multiplayer game since the AI isn't very good and either brings countries to ruin or become completely outclassed by player-controlled countries to such a degree that there is little real challenge in solo games. Therefore if you are no fan of multiplayer, I would probably avoid this game.
But... the multiplayer can be pretty good in this game when you get a good group of players together, and there are enough people still playing this that you can get good games fairly often. However, if you are looking to play this game online, extensive knowledge of the nations you play and the modern world in general is pretty much required. Hosts for this game tend to be elitist and have few qualms about kicking and banning people who play 'unrealistically' in their games. While this may sound obnoxious (and it sorta is), this also helps keep games interesting rather than just devolving into world war nukefests that, while fun the first time, rapidly loses its appeal after that. In other words, the multiplayer for this game is ideal for people with in-depth knowledge about the modern geopolitical scene and are able to apply that knowledge to their gameplay.
The game itself is pretty solid and does not take too long to learn, but there are numerous issues. Aside from the AI being generally bad, runtime errors can ruin your fun and crash your game with virtually no warning. The world economy tends to destroy itself after a few decades, though mods try to fix this and are almost always used in multiplayer games. The game does send "mails" about high-priority events like economic problems or the use of nuclear weapons, but other events, such as when other nations start a nuclear program or even when wars break out, can slip by almost totally unnoticed.
Lastly, the game is lacking some critical elements that are major parts of the modern world, such as the Nuclear Non-Proliferation Treaty that keeps almost every country in the world from building nuclear weapons. This is something that would be particularly useful for multiplayer games, where too many people build secret nuke stockpiles that can end up ruining games because the lack of information the game gives about them. This can result in a small nation building a giant nuke stockpile, and then using it, without anyone else having the faintest idea this was going on until it was too late. From my observations, secret nuclear stockpiles and their usage are a major cause for multiplayer games ending early, with few people wanting to play after a nuclear apocalypse.
Overall, SP2 is a competent and deep multiplayer strategy game that, nevertheless, has enough glaring issues to lead me to suggest that anyone looking to buy this game should think carefully about it (and probably wait for a sale). When played right, it is an excellent game with endless amounts of replay value. But since these good games rely on every other player in the game not acting like a complete ♥♥♥♥, patience and a willingless to put up with some annoyances is also necessary to enjoy this game. But if you are able to endure all the irritants that this game and its players can throw your way, then you will find an often very fun experience awaiting you. :)