My first game on Prince I got taken out by the more powerful Greeks but I knew it was coming. Playing a new game on Prince and man, the AI is very sharp. It don't help that I havn't played a proper Civ game in years.
It really seems that the people who humped the hell out of IV are having the hardest time moving to V. Thats fine if they need their super polished, twice expanded IV but don't QQ that V isn't as good. Its a poor comparison. If V was just a new version of IV, I doubt the buzz would be so high right now. I sure as hell wouldn't buy it.
They knew that some would not like the changes but the series needed some fresh air. In this case, the change is for the greater good. A few will QQ but the majority will be quite happy.
I've heard nothing of crashing bugs during X number of turns. Have you tried installing the game on another pc and using that saved file on it and see if it still crashes? No 2nd PC, ask a friend to try it. Hell, post the file to any number of free hosting sites and link it here and let us see.