New Civs are cool, but some like Attila just seem like copies of existing Civs (Mongolia).
They have a similar theme (as they did in history) but they play very differently. For one thing, the Huns are a much earlier invasion force, and their Unique Units reflect this - replacing the Chariot Archer and Spearmen Units. The Mongols replace Knights and Great Generals - and the Khan creates a completely different series of battle tactics than the Huns can employ. Also, the poor Mongols get a bonus to attack city states, while the Huns have a bonus starting technology, bonus production from pastures, and raze at double-time.
Frankly, the Mongols pale in comparison to the Huns if you want to warmonger early and often.
As much as Horse Archers are cool, the Huns are all about the Battering Ram. It's amazing and it unlocks on your second earned tech - plus you can hit an Ancient Ruins and upgrade into it. They are probably the
only civilization that can provide a credible Ancient Era rush now. They can start a run-away on Domination in the middle of the Classical Era!
I'm playing as Austria in my first game and haven't used their UA yet, don't really see much purpose to taking over a CS.
You get the city
fully intact. Compare that with conquering a city. You get it in rebellion, with almost all its buildings burned down, and you draw massive Warmonger penalties for it. On top of that you can do this
anywhere in the world. Want to open a front on the other side of a Pangea or establish a beachhead on a new continent? Bam! Done. It would've taken a hundred turns to build what you just married into. It's ridiculous.
The Hussar unit sucks because it's a mounted unit and it's really annoying they didn't make mounted units better.
Mounted units are awesome. They just happen to have an allergy to sharp sticks. Infantry and Archers are bad at attacking cities now anyway, so much of the stigma of Cavalry has been removed.
Faith and espionage are pretty much just diversions from the game. Stealing techs seems to me a little cheap. Learning about who the AI is going to attack is great though. I founded a religion but other than that, there doesn't seem to be much to religion. Just use missionaries to cities and spread it and reap the bonuses.
Your religion is what you make of it. The bonuses alone are worth serious consideration and customization. If you take the right policies you can spend Faith on things other than Missionaries - like soldiers or buildings that provide a significant boost to a city's Faith, Happiness, and Culture, all for 0 Gold and 0 Hammers.
- Marty Lund
per 5 foreign followers, and spread my religion like wild fire. With relgious texts boosting my neutral spread I targeted 1 city per ai and city states and let auto spread do the rest. 
to a missionaries 4 
The Huns seem like a serious force to watch out for, just as predicted.
