I recently found seasons 1-3 used for cheap. I have been slowly working my way through it. My summary review is that if you like espionage, military, and plot twists, you will enjoy this.
Themes are heavy in espionage, terrorism and counter terrorism, military/combat, patriotism, betrayal, and sex.
I thoroughly enjoyed it and can find no real faults with it.
It features excellent acting
*Damien Lewis who played Dick Winters in Band of brothers.
* Claire Daines
* Mandy Patinkin
* And a very strong supporting cast
Acting A+
Action A+
Plot and story A+
Intrigue and plot twists A+
Female nudity A+ (not much, but yowsa good topless Morena Baccarin super hot)
Like I said, thru seasons 1-3 very addictive and I can't fault it. I know there's more seasons and I'll be interested to get them and watch it.