Actually, I find that BNW brought much of what was lost to CiV. But yeah, up to G&K it couldn't hold a candle to CIV+BtS. Now it's evenly matched.
My main gripe with Civ5 is it's state on release (here Paradox and Firaxis are evenly matched
Also the AI is atrocious. They never taught it how to handle one unit per tile. And using a one unit per tile without implementing things like covering fire and suppression is just bad game design and/or lazy. Argh, I need to stop now. This is making me more angry than it should
That said: I still love Civ4 (with DLC).