It varies. Tijuana is one of the more dangerous cities in Mexico with a murder rate of 107/100k from 2006-2010, but that's way behind Cd. Juarez with 485 over the same period. By comparison the national average was 30.8 and Mexico City was 7.36.

I couldn't find stats for Ensenada but Tijuana makes up over half of the population of the state of Baja California, which in 2010 had a murder rate of 28. I'd bet Ensenada is well below that. Baltimore by contrast was 34.8 and Oakland 22.

(FWIW the violence in TJ has abated considerably in 2011 as the Sinaloa cartel has effectively won the turf war that was raging.)