Carla Gugino as Karen Sisco was amazingly hot, brassy, and devoted to her job as U.S. Marshal. Did I mention hot? The best episodes were ones that allowed Gugino to show off her smoldering sexuality in a well-written, tightly plotted script. However, it seemed inevitable that without a strong enough supporting cast, Gugino couldn't carry the show alone.
She was a hot, sexy, lead actress, and it seemed the network wanted to pull off another Alias, yet the premise wasn't juicy, suspenseful, or glamorous enough to sustain itself. Thus, you needed to rely on character, and making Sisco be a hard-drinking, somewhat depressed and obsessed professional, with a strong father figure, wasn't attractive enough for an audience. The plots tended toward the depressing, while the fuzzy cinematography didn't help in pumping up the action. The contained nature of each episode, didn't provide enough dramatic tension for the audience member to tune in the following week. Additionally, the dialogue was also somewhat pedantic.
Overall, the show was strongest with Gugino displaying her confident sexuality and brassy personality, but that didn't always shine through in the script, or was reflected off of good supporting characters.