Another problem is stuff is so simplified it makes me cry. Lets take happiness buildings for example.
Civ4BtS: Monument gives happiness if you're charismatic. Temple gives happiness but you can build it only if you have religion. You can build more than one if you have more than 1 religion. Also temple can give you a bit of science / money / hammers under appropriate circumstances (University of Sankore, Minaret, AP). Then we have Marketplace which gives happiness only if you have some certain resources. Then there is theater and Colosseum, theater gives happiness if you have dye, Colosseum just gives +2, and both give happiness for culture %. But that's just buildings and I didn't even mention UBs. There were others ways to get happiness. Being charismatic, adjusting % slider, resources ofcourse, even whipping (i.e. reducing population) was a legit way to make unhappiness go away under certain circumstances. Religion but only one of all possible and only if you made it you state religion; unless you have Free Religion civic adopted in which case all religions give +1 happiness each. Do you see how many different interesting stuff we had? How many possible interactions? How many possible ways of playing?
Now what we have in Civ5? A short list of buildings which can only be built subsequently and all of them gives some amount of happiness in exchange for some amount of maintenance, every single building is basically a variation of the same, just maint increases.