I've only seen a few episodes here & there, pretty much all from the 1st season. I love the characters but there's something about the tone of the series that I don't like; like whenever I watch the series, I wind up encased in some kind of amber colored film. Often it seems to be just going for weird for weird's sake.
"DNA Mad Scientist" is the episode that really drove me away. The needles in the eyes were too gross for me. And it seemed very strange that everyone treated Pilot so cruelly, even Zhaan.