Think of it this way; if MOO3 had been exactly the same game but had suddenly taken away your ability to change 1/3 of the variables, this would have made the game even worse.
If it had been a manageable spreadsheet, that would be one thing, but when it is a spreadsheet where you can't tell what effect you're having by tweaking a couple of variables....
Terrible game design, just terrible. I also really wanted to like the game and followed the development fairly closely, and bought it as soon as it came out. Damn, that game sucked....
I guess I should have been able to see this beforehand; "You can do anything, you just can't do everything" is a terrible game design ethos. No-one wants to be ineffective, or to have to fight an inevitably sub-par AI for control of their empire.