Same thing in SimCity. It got more and more complicated to the point of overwhelming the user and drowning out the fun little things, to the point of collapse. They tried to save it with SimCity Societies, one of the most boring games I have ever played - it was far too simple. (You didn't zone anymore... you placed the exact buildings you wanted.) They never returned to the happy medium that was SimCity 2000. I'd say Master of Orion 3 did the same.
I thought Civ IV was pretty good. Maybe a tad bit overcomplicated but it was mostly in how the information was presented - maybe UI improvements would've been enough.
(On the other hand, I always got bored in the late game with all the units driving around... I really, really prefer the late game in Civ V.)
Just have to say I don´t agree.
Complicated is not the same as overwhelming and imho SimCity 4 is clearly the best of the lot. Hell, I am still waiting for a real sequal.
Civ IV being overcomplicated? Not for my taste. The problem is that the gamecompanies, well all companies, want it all. It´s not enough to make a great game that strategyfans will enjoy and buy, they want to eat the cake to! To me, it´s all about greed.
Good thing that there still are companies, like Paradox, that cater to "our" needs and realize that, "Hey, let´s not make FarmVille! Not eveyone on earth will buy it but let´s do what we know how to, be happy with that and make a buck in the process."
