Yes. You should watch this, but commit yourself to atleast the first 3 episodes.
It's not that the early episodes are bad in any way, but they do churn out some extra story and pacing quibbles which drag them down a little.
But soon enough the show hits the sweet spot and some of the episodes are just brilliant.
Bonus points, all episodes are linked by one story arc but it won't hurt too much if you just dip in and out. Although I think you should watch the entire thing because it's certainly one of the more under-rated shows out there (despite the fantastic viewing figures it got on US networks).
As already mentioned, this show matures rapidly. It starts off great, and just keeps on improving.
Cast are amazing with some great guest appearances, you may be forced to suspend your belief here and there but it's no worse than any other TV drama.
Do watch, certainly has more quality than a lot of the rabble I see on British TV. The lead and supporting-lead are an unlikely but fantastic duo.
Edit: I forgot to mention, dialogue is smart and to the point, lot's of action sequences (guns, fighting, explosions, covert ops style stuff), very entertaining!