One of the best sci-fi series there was.. until Fox terminated it for no reason. We'll never see season three, and should I ever build a time machine I might be tempted to go back in time and take out the Fox exec's mother who was responsible for it's cancellation. Seriously.
Summer Glau was quite believable as the complicated, "more going on than she's letting on" terminator Cameron. Brian Austin Green plays a soldier from the future, and surprisingly does a strong job, especially in Season 2's Episode 5 "Goodbye to All of That". Lena Headly does a solid job at Sarah Connor, and Thomas Dekker as a teenage John Connor was completely under-rated. It was a solid cast, a superb plot and story arc and premise. The show was just getting off the ground, and had there been a Season 3 would have gone in an awesome direction.
Ah, forgot to mention two others in the cast. Shirley Manson (from "Garbage") plays a seriously cool bad/good terminator. She has acting chops that I wasn't expecting. Garret Dillahunt is one great actor, who plays Cromartie/John Henry. He brought a bit of personality to the whole stone-cold emotionless terminator character. "Thank you for your time." (fake smile). Leven Rambin plays John Connor's girlfriend and was quite a good actress. Last but not least, Stephany Jacobsen is just dan good in anything she is in.
So thank you, Josh Friedman, for this show. It was one of the truly best and in my mind, trumped any Terminator movie that came after T2. We saw what you were doing with the show, where you were taking it, and it was killed off in it's near prime. A tragedy, but none-the-less I'd rather have had two seasons with a cliffhanger we'll never know the conclusion on, than never having seen this show to begin with. It was great!