1. The game works for me ... now. I had to get a video card and more RAM for my destop for it to be playable. I do see the CTD problem ... a lot.
2. After upgrading to 1GB of RAM, the performance is OK, but I think it could be better. I'm unconvinced by arguments that the sluggish performance on large maps is inevitable.
3. Bought. Civ IV is running on three machines in my house (a laptop and two desktops), all bought from Dell.
4. (A) -- Laptop. 1GHZ Pentium CPU, 256MB RAM, GeForce2 built-in. Video drivers updated many, many moons ago. Windows 2000 SP3. Civ IV installed and ran fine, although it quickly moved into a swap-o-rama and became very sluggish. No graphics problems except sometimes seeing terrain features in the black part of the screen.
(B) Desktop. 2.4GHZ Pentium CPU, 1GB RAM (was 256MB), GeForce5200FX. Drivers updated when card was installed, about ten days ago. Windows XP, up-to-date. Works acceptably; still sluggish on large maps. Occassionally crashes to desktop.
(C) Desktop. 3.0GHx Pentium CPU (w/HT), 1GB RAM (was 256MB), GeForce5200FX. Drivers updated when card was installed, about ten days ago. Windows XP, up-to-date. Works acceptably; inexplicably has bursts of performing very well, and then reverts to being kind of sluggish on large maps. Frequently crashes to desktop, especially when the game hasn't be manually saved in the last 2-3 turns. Crashes can happen when he camera is moving (either by me or by the program showing me enemy moves), or when zooming out to the world view. Once it turned my monitor off(!) (so it may have crashed the video card).
Multiplayer games between computers A and B (the main reason we have two copies of CIV IV) are still (even at 1GB RAM) slow enough that we each bring a book to read while waiting for the computers.
5. I play (a) turn-based strategy games (that is, Civ), (b) Magic Online, and (c) (sometimes) RTS city-building games like Zeus or Pharoah. I've probabaly being playing a couple of hours of Civ IV every day (some days much more, but I do have a job I have to go to) since it came out; I usually will maybe play 5 or so hours of games a week.