2nd vote for Germany. With the new UA you can build so many friggin landshnekts it's ridiculous. Honor & Tanks have both been boosted, perfect for Germany. Autocracy is very nice later.
My aztec game was really fun too. Love seeing all those bonuses when you kill stuff. If you build & upgrade the UU and finish honor, you get Life, Culture (double) Experience (1.5) and Gold all from a single kill.
France/Liberty was probably the most sucessful game I've had so far. That's my favorite style of play (fast expansion) and France is definitely the best at it. My start was so powerful I coasted through the rest of the game...next time I choose France I'll probably try immortal.
Another fun game I was Chinese on an isloated continent. This was my first game post-patch...got to make use of the Commerce finisher which was extremely powerful (+120 gold per turn).
I started an OCC/hanging gardens game but I ran out of tiles to work & had no specialist buildings. Bad idea building the OCC in a desert. Poor planning...will need to revisit and try again because there is definitely potential there.