Could you elaborate on this? Specifics give a much better perception of the picture you're painting.
Hard to give specifics - it's the ENTIRE GAME that is a steaming pile of dung.
The only things I would salvage are the idea (not the implementation, but the concept) of social policies, and the limited resources.
The hex and the graphics are up for the jury to decide (I hated the lifeless, still graphics of Civ5 and their white clouds of undiscovered terrain, but that's just a question of taste here).
Everything else is simply crappy to the core, and far inferior to Civ4. The interface is consolish and ugly, the game has zero immersion and feel horribly artificial and gamey. And the worse is, even after slaughtering the whole rest of the game on the altar of gameplay, the gameplay itself is a borefest.
I won't even start on the force-feeded and totally useless Steam.
No really, Civ5 is so far the one and only Civ that not only didn't passionate me, but actually bored me to the core. That's a huge feat in itself, but not the kind you would really want to replicate.
Refocus? When was the series was ever focused on immersion, scale and feeling like you are actually leading a civilization instead of whatever t is that you control in the games is most like?
Civ3 definitely had this feel (though it was far inferior in gameplay to the 4). Civ4 was lower on immersion in general, but at least the map partially made up for it with lots of animations and sounds, and it definitely did feel more like civilization and not like a subpar wargame.
And anything is superior to Civ5 in immersion.