Rubicon is really great, once you get the feel for it; its feel being that barely anything happens in the way of revelations and 90% of the show is hardcore character development.
It's a lot like Stargate: Universe, in this regard, although the setting is obviously greatly different. With that show, I was basically just waiting for the aliens at first, wondering why it took so long until someone pulled out a laser gun, but soon realized that this wasn't like sci-fi shows I was used to and started to soak in the character work. Rubicon is the same way, in that it's not your easy-to-follow, single-serving mystery-solving show where one mystery is neatly resolved in every single episode and long-term storylines are secondary, instead offering installments in a bigger picture.
Me, I love it. I love that this is even possible in a period where shows can get canceled after a couple of episodes if they're not instant hits. AMC seems to have some credit after Mad Men and Breaking Bad (which was also very good at those installments-rather-than-episodes episodes, like the one where Walt and Jesse chase a fly for 45 minutes) and they are willing to give Rubicon time to develop something more satisfying.
I still have to get fully comfortable with episodes "just ending", as in not really building towards a big blow-off but choosing a more subtle route, but that's just because of conditioning. This is probably my favorite show at the moment, until Breaking Bad returns. (I also have a soft spot for SG:U, especially given the acting of Robert Carlyle and Lou Diamond Philips, but Rubicon is a bit more down to Earth, if you'll pardon the play on words.)