Some (note qualifying word right here at the front) of the people that complain about the perception of extra bugs in the early release date are the same ones that complain about "bugs" that are really their own personal preferences about how the game works. They have complained for the last year or more, they'll complain when it's released, and next year they will still be complaining. Since "feature that I want that isn't in the game or doesn't work my way" is not a "bug" by definition, such people are inherently incapable of being satisfied by Civ4. Everything else, as they say, is commentary.
(Note that complaints about most real bugs don't take very long, and for some reason people don't feel the need to broach them every day. For example, the "sub bug" in all Civ3 versions. Once explained, no one says that it isn't a bug. You merely get a lot of wailing and gnashing of teeth about why it wasn't fixed and/or speculation about why it might have been difficult to fix.)
It doesn't matter to me. When Civ4 is released, it will have bugs--probably some substantial ones, viewed with 20/20 hindsight. All games have bugs. I'll get it for Christmas or soon after. It will have approximately the same number of bugs then whether released for Halloween or Thanksgiving. This doesn't make me a "fan boy". It indicates that I have some perspective.
If I had time to play it before Christmas, I'd probably get it early despite the bugs. Why? Because very few games entertain me. That a buggy (but playable) Civ4 is more entertaining than most anything else available is just life. I have different preferences than some people. It's a game; not your food money for November.
PS. Rhetorical question: Why are those that complain constantly about Firaxis, Civ, Take2, etc. the ones most thin skinned about people complaining about their complaining?