I pretty much agree, I really like hexes, combat and the city bombardment also, Social policies rock and I enjoy the happiness and the way golden ages work, I also like the ability for great generals to start a GA or put down a fortress, the fortresses can really save a game, they are powerful.
I am unsure about great people building their specials stuff outside cities, I don't like or hate it. I am unsure about puppet states tbh, I don't think they fully thought them through. I like the idea of puppet state or annex but it is badly implemented imo. I don't like the fact that courthouses are only there to quieten a puppet state down. I think they missed a trick by not having crime in this version with courthouses and jails e.t.c dropping crime rate and the crime rate of a newly conquered city being higher than normal. I am on the wall regarding the tect tree, it seems simpler and I am not sure if there are as many short cuts. Also Giant Death Robots

(GDR's) apparently don't need robotics either!! comon!!
The fact that there is no maintence I don't like, they have obviously replaced it by adding maintence to buildings instead but in my last game where I was cash poor this bankrupted me. They changed building wealth so that it stops a city adding maintenance via units or buildings) and creates a small amount of cash but also stops you from (in this version) churning out a shit load of troops (where-as in the old version it would allow you to grow and grow and grow). It sounds silly but I don't like the save game section of the game, I don't like the diplomacy either, this I think is unfinished and they'll polish it up. I don't like the city screens, I vastly prefer a screen with lots of info rather than a long list of buildings with pretty little pictures that you have to scroll down to see them if your city has built alot. I don't like the changes they made to specialists, and I would prefer my wonders to kick out more culture, it seems lame atm except for a few. I would prefer more screens to see how I am doing vs the AI (Civ IV hang over) and I would like a screen telling me how many social policies I have vs the various AI's.
So on the whole I like the game but think atm I prefer Civ IV. Think I will leave it for awhile and pop back and see what they have changed.
Sax.