I'm not disappointed to the least, but I would make the game more difficult than it appears now. AI is aggressive enough for my taste but everything feels too quick, like colonization, culture flipping, core crafting and such.
Making the game more painful but not overly painful would add to its longevity and rewarding-ness.
I dont mind the speeds of core creation and culture flipping, especially if you take into account the price. Doing to much of either could really set you back in other areas so if you want to advance your sort of forced to slow down your conquest.