I watched the show from 2th season onwards long time ago on tv, spanish dub, and recently after starcraft II and the "Give your child to Psy-corps" comertial made me want to see the series again.
The acting sometimes is trully subpar, the special effects were great.. on their time, the makeup on most races still holds credibility (except kosh's, but that is more on the special side side I think).
The thing that's more anoying to me, and the thing that draws me closer to the series is the way that "Foreshadowing" is handled, two examples from early 1st season that weren't good:
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Londo's rant on chapter 1, of his people getting a free premonition on the day of their deaths, as I already saw the ending and the other 4 times that this profecy was explored, the first time is done awfully.
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The incident of the commander's girlfriend on that random planet it was like "hey we are ants there are giants in the universe!", contrary to the last one, this side was done somewhat alright, but the "payoff" was trully a let down.
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Talia Winters centered plots, as the actress left the show abrutly, I kind of understand, but the plots of the guy with the exposed brain, and the telekinetick man were just left in the air.
But others I see that the plot was weaved very good, like:
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The anti-alien movments, since day 1 creeping into the foreground time after time.
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Deelen's secret, little pieces of the mistery of her and the battle of the line.
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Londo and G'kar hatred and frienship, even if it's start was horribly written.