As I'm watching Babylon 5 on go90, season one surely sucks..
Everyone says that. But if you can make it to the end of Season 1 it starts picking up from there.
The Season 1 episodes to pay closest attention to are Episode 13 (Signs and Portents), Episodes 18 & 19 (A Voice in the Wilderness parts 1 & 2), Episode 20 (Babylon Squared), and Episode 22 (Chrysalis). There are other good episodes among those, but those are the ones really critical to the plot going onward.
From Season 2 on, there are fewer and fewer "filler" episodes and more "wham" episodes.