The GeForce MX series has been much more stable than some way more expensive cards - but go check out the bug reports forum - you get to join my special club, called the "toast only" club. In other words the yield display only displays the food icons, not the hammers and coins. Really annoying, but not a game breaker. In addition there a few other graphical glitches people have reported such as being able to see floodplains even throught the fog of war.
Just make sure you set the graphics in the game to Medium and game speed and play will be fine however. I have played for MANY hours with my MX 440 card, and only experienced 2 CTDs ever. And who knows if they had anything to do with the graphics card. Plenty of people with 6800 GTs and other expensive Nvidia cards, or whatever the expensive ATI analog is, have experience TONS of way worse problems.