I've been watching this show from the very first episode. I have to admit I wasn't very convinced but I gave it a chance and watched the second episode and it got better. Rufus Sewell does a great job playing the absent minded professor, that needs to be taken care of in order to keep him out of danger. Marley Shelton, on the other hand, started out a little bit off (as well as her character) but has improved a lot in recent episodes and now I just can't imagine another actress playing Rachel Young. The chemistry between the main characters is excellent and is growing with every episode. Not romantic relationship is implied (nor I want to see one), but those conversations between Hood and Rachel where they talk about their lives are very interesting and they come out natural.
I hope CBS gives this show a second season. The show is different from those procedural shows. Science may be boring but this show gives you the other side of it. Sure sometimes the science is inaccurate but, what isn't on TV? There is absolutely no comparison to Fringe since the characters have an interesting dynamic and are both very strong.
If you haven't watched this show, give it a chance. You might get hooked.