Loved season 1 - I've re-watched a few of the episodes a couple of times now. I loved Zima Blue (weirdly), found Beyond the Aquila Drift strangely unsettling (in a good way), thought Suits was cool, and really enjoyed Lucky 13 as I've read the entire series of books (Marko Kloos Frontlines) it was based off.
Thought season 2 was disappointing in comparison. I don't think I've re-watched any episodes but Snow in the Desert was OK as it was written by Neal Asher, and I've read most of his Polity books.
Thought season 3 was better than season 2, but wasn't blown away by it. Bad Travelling (again Neal Asher) was good, very reminiscent of the Spatterjay series of books, and Night of the Mini Dead raised a few chuckles along with Mason's Rats.