I love all of Mexico, and in my opinion Mexico City is absolutely magnificent and should not be missed! Just a very, very cool and exciting city. But safer than Buenos Aires it is not. Then again, BA remains one of the safest cities in Latin America, whether this forum wants to believe it or not. I don't think people really get this unless they've lived in another Latin American megacity and have had to adjust their lives accordingly in a way one generally still doesn't have to in BA (not yet, anyway). Also, I'm not going to get into the arguments but I have it on very good authority that backpacking around the border would be an extremely foolish thing to do right now. My friends with relatives there can't even go visit them anymore. Very sad for the people of Mexico.