Jumping into this topic, I've so far watched the first four seasons, and still have yet to get to an episode that tops "Justice" as the worst episode of the show so far. It's literally one of the worst hours of television I've ever seen. I would like to see this Wil Wheaton thing if it's available somewhere filmed (I would assume it is - either that or three or four Board 8ers who just happen to be in this topic were at the same convention). I would elaborate, but talking about that episode is not something I enjoy doing and I tend to go overboard with my hatred of it, so we'll just leave it at "I probably agree with Wil Wheaton on this one". It just felt like an abominably bad fanfiction by some sex-starved 35-year-old Trekkie who lives in his mother's basement and has no concept of good writing, to turn the old cliche up a couple notches.
But yeah, the first season is definitely the worst, and each season afterwards (at least up to 4, which is where I've watched to) is a HUGE step up from the last. 1 is terrible, 2 is getting there, 3 is good with great moments, and 4 is a pretty great season of television (with a couple low notes - The Host being the second worst episode so far....and no, I'm not counting the Season 2 finale; that's not an episode).
I barely remember most parts of the first season so I haven't really been able to comment too much yet (having replaced it with better memories of the second through fourth seasons), but I had to comment on Justice. Featuring all the characters on the whole show at their absolute dumbest.
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Recorded B8 Mafia record: 13/24