I'm happy with the 3 left, Arabia and Scythia are my personal favorites, but I guess those 3 are stronger overall.
Australia = 5 (8-3) all 3 are strong, and I don't think there is much difference in strength, it's more a play-style thing. I'm not the biggest fan of unique improvements in general - it's fun to build many outback stations and all, but not really my cup of playing. And I just think the Digger comes a bit too late for making a difference between these 3 civs left. The +100% production always feels a bit gamey and exploitable.
Aztec = 8 strongest synergy of all civs with their abilities. I disagree on the best science victory civ though. The space port is not that much of an issue. If you can shave of some build turns or even the complete thing with builders, that's nice. But it doesn't compare to a civ with lots of Hansa that get's the GEs for space production afterwards ;-)
Germany = 11 (10+1) For me, this is the easiest civ to play with when not going total domination. The attack bonus against CS makes rolling over them incredibly easy, +7 feels much more when playing than it does on paper. The military card is always handy, especially when choosing Classical Republic, what I usually do. Since I almost never choose Monarchy or Fascism, I can use it later as well. There are quite some good red cards in there. The U-boat is not really necessary, but coastal raiding is always a nice thing to do (you don't need the UU for that though) - combine it with Raid and Sack and you can get some very nice boosts without acquiring warmonger points by other civs. I didn't even mention the Hansa and the Free Imperial Cities yet and won't make this post longer: nearly everyone has realized how game changing they are.
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. But I would do these changes in the final rankings: I would put France higher, Rome lower and Poland to the top ten. But nevermind.
