I don't normally enjoy science fiction shows, so I was surprised to find myself being drawn into this one.
I initially started watching because I liked John Barrowman but by the time the series had come to an end, I'd enjoyed the whole series. It's fun science fiction that doesn't take itself too seriously, it's much more character driven than most other sci-fi shows and all of the characters bring something different to the show, as well as being rather nice to look at.
If you like your science fiction to focus on character relationships, rather than aliens and alien artifacts, and you don't have any problems with bi-sexuality, then Torchwood is a very entertaining and somewhat different science fiction series. It isn't a series for sci-fi geeks.
Captain Jack - Leader of the group, 51st century time agent who's currently working on modern day Earth, handsome, flirty, can not die using conventional methods.
Owenn - medic, a bit full of himself, not afraid to speak his mind, likes the ladies.
Toshiko - Computer expert, perhaps the most 'normal' of the group, feels like a bit of an outsider.
Gwen - the ex-policewoman who accidentally stumbles upon Torchwood, views situations from a human view point rather than a hardened view point, struggles to mix her professional life with her personal life.
Ianto - is to Jack what Alfred was to Batman, takes care of the Hub whilst the others are away, young and sexy, likes to wear a suit, quiet and sensitive, keeps his emotions bottled inside until a crisis occurs.
Some people have accused Torchwood of having too much sex. This simply isn't true. Apart from episode two which is a bit fruity, Day One, the sex is kept to a minimum and is never graphic. It would actually be more accurate to say that Torchwood has a fair amount of sexuality, rather than sex itself. Also, apart from Captain Jack himself and a cyber-babe popping up, there's little connection between Torchwood and Doctor Who.
It's true that Torchwood is a bit patchy and it does have a few plot holes - like Jack not knowing that he has a cyberwoman in his basement - but if things like this don't bother you, give Torchwood a go.