This is one of the best recent European productions I've seen. It offers a reasonably good plot (not very original, but still interesting), enough twists to keep you interested, some acceptable action scenes, credible characters and surprisingly good acting.
Do not expect Hollywood-like explosive action or amazing special effects, this is more of a psychological thriller with lots of indoor acting and some short but intense action scenes. It's more of a mystery/crime drama with a SciFi twist, and it has more in common with "Criminal minds" than with "Star Trek"... until now anyway (only 3 episodes aired).
As drawbacks I can count poor acting on behalf of some of the secondary/supporting characters, British style police work (a lot less spectacular than what we see in American movies) and last but not least the ugly female characters (you probably have to be British to appreciate their beauty).
9/10 from me, such productions have to be encouraged. It was a pleasant surprise and I'm eagerly expecting the next episode.