So I took a few months and I have gained Anno 2070 only 2 months ago, including extensions available. So far I could find not a single long-term server failure. Once came a message, I could but soon after the game but start without restriction. Apparently the servers have quickly recovered.
The Online compulsory means with me yet three star deduction, because I always have to worry about my cherished game eventually not be able to play more. The grandiose gameplay makes my rating but increased to four stars because I never had so much fun at a Anno had like this. The game is much longer interesting. Frustrations are rare because the logical planning often rises and errors in planning are more nahzuvollziehen. Thus, one does not make the same mistake twice. I find this more evident than with the predecessors in this version.
You can use and combine the technologies of three nations within the game. So is not entirely confined to his first choice. That extended the experimental phase and enticed to try a more likely time other ways. Consequently, one has to coordinate on even more needs than its predecessors and has to think carefully about which island you can ascend.
The graphics are great. Only the maximum zoom was formerly better. Sometimes I miss the distant look at my great world. But there is indeed now a floor down below the ocean surface.
I've played all Annos, but this version is the first where I have not aborted the mission and am quickly changed to the endless game. The missions are more varied than before and offer enough challenges. With the predecessors they have been to me quickly get bored.
Conclusion: One of the best games on the market at the time. Here again the evil Online compulsion without security if the game is still playable in ten years. Nevertheless, I would say this time a definite buy recommendation.