I ventured across to many border towns in the 90's for good, cheap, fun entertainment. Damn, I miss those days. I wouldn't even consider it today. The risks far outweigh the rewards today. I'd even be hesitant to visit resort areas such as Acapulco, Cabo, Cancun, etc.
The U.S. State Department has issued travel warnings for Mexico:
http://travel.state.gov/content/pass...l-warning.html