Worth playing if you liked Supreme Ruler 2010, very different from Superpower 2.
The Good:
+ability to play on the world map
+very in-depth management of a country's economy and military
+well-researched information on the countries
+being able to pass responsibilities to ministers
The Bad:
+performance issues (I have a pretty high-end machine and scrolling over the map is very cranky)
+very little feedback (why did my country hate the USA? why did they love Latvia? why do my people like me and why don't they?)
+very poor diplomatic system with no feedback (what impact "Free Trade" has?)
+while the military and economic management is pretty in-depth, they're not very real-world like: financially you only control taxation and spending
+no control or whatsoever over the social life of your country
+while the interface is responsive, it's also very '95-ish, as in bad design
+no detailed statistics and/or graphs (population, approval, GDP, GDP per capita, etc)
+very poor map layouts
+ministers don't seem to always be doing what you tell them to do (I set DEFCON to 4, so he mobilised most of the armed forces, and when I set DEFCON back to 1 and told him to reduce mobilisation, he didn't)
+terrible tutorials
+many other details that you don't understand how they're modeled in the game (for example military logistics) because they're not explained well
+I liked the globe and layouts in Superpower 2 a lot more then the map in this game
I love this genre of games so this is not a noob talking. All in all this is a good game, and all the bad things listed are actually things that I would have liked to see in the game. A Superpower 3 would probably be close to perfection. Anyway as there are very few games in this genre, it is a welcomed addition.