One of my favorite shows regardless of genre. I agree with RedCOMET, the first part of the first season you're trying to understand the universe and the characters, and the actors themselves are bonding / learning .. once season 2 kicks off, it really picks up speed, and you get some fantastic TV.
The chemistry between Browder and Black (the two main leads) is amazing, even now I still wonder if there truly wasn't something off-screen we never knew about
Season 1 had some rough spots, couple episodes I can think of that stick out would be the one where John is marooned on a planet with his module, and runs into a native tribe of people and some ridiculous things happen, and a lot of bad acting. The other was an episode where Chiana rebels a bit, and hooks up with a bad crowd of junkies on a "graveyard planet." Ugh, that one makes me cringe just thinking about it.
Some people have problem with the animatronics - namely Rygel (fancy muppet - he really grows on you. Quite a few friends who hated him in the beginning ended up actually liking him quite a bit during the show.
If you're into Sci-fi, you can't go wrong with Farscape. Claudia Black is gorgeous, the show's humor is great, and the writing gets amazing. You owe it to yourself to at least watch through Season 1