I could switch the 4's with 5's, and policies with civics, and create the opposite argument.
You can build wonders, select tiles, trade, do EVERYTHING you said you like doing in Civ4. Policies take more thought than civics. Trading takes more thought since you have a lot more uses for gold. The only reason war seems easy is because we can actually put more thought into it, and therefore see better results. Almost every aspect has more thinking involved. Sliders actually took away complexity (if that's a word I want to use here) as it streamlined EVERY one of the currencies into one. That's right, I said streamlined, that word that people seem to hate because it was used as a buzzword for Civ5.
Honestly, I don't get the problems. I just don't get it. I tried to go back to Civ4, which I loved dearly at a time, and I ended up having one of the most boring games, with half the mechanics not even being used. Civ5 has me using all the mechanics no matter if I'm going a spaceship, culture, diplomatic, or domination victory. In Civ4, I can ignore culture past the BFC, espionage completely, maintenance is easy to get around by a single wonder or trait, and war is fought only by 2 SOD's bashing heads. The game boils down to science and production. I wasn't a bad player too, I've won Immortal games using every victory condition.
You just sound disgruntled because Civ5 didn't meet up to your expectations that you created in your head. What more do you want? If it's the bad AI, play online against other people.