I've been watching this since the premiere a couple months ago, and I am firmly of the opinion that its the best thing on TV right now. I never could get into Lost, and I'm way too behind to try Heroes, BSG never really did it for me, but I'm loving this.
The premise is really simple, straight out of A-Team or Mission Impossible. Four thieves who are all the best in the world at their respective fields are led by one 'honest man' in heists targeting the richest and most corrupt individuals in the world, in order to help those who have nowhere else to turn.
Snappy dialogue, fantastic characterization, great storytelling, and tongue just firmly enough in-cheek make this thing a truly awesome piece of viewing. I haven't seen a sub-par episode yet, and I eagerly await the new one each week. Supposedly this is one of the biggest shows on right now, but I don't know anyone but me who's been watching it.