The big problem with Babylon 5's early episodes were B soap actors they brought for stand alone stories. Sinclair is wooden as hell at first too, but so was Picard. There's a great viewing suggestion list I always recommend to new viewers that skip a bunch of S1 episodes.
The show wouldn't be the same without Boxleitner (Sheridan) taking over as lead, but learning Michael O'Hare's battle with depression, and appreciating him more on a multiple viewings, I wish he got to play a bigger role.
I learned an interesting tidbit about Sinclaire's gf Catherine on S1 (Julia Nickson) while watching Rambo II the other day.
She was Rambo's HAF co-star. It always bothered me watching her on Babylon 5, wondering where she was from lol. I didn't like her acting on Babylon 5, but she was great in Rambo.
she was in episodes of DS9 and TNG too
Babylon 5, DS9, Stargate SGI/Atlantis, and BSG (terrible ending though) are all above TNG IMO. The Expanse is joining that goat Sci-Fi list too.
There's a great torrent out there, 100+ gigs with remastered visuals/audio of all Babylon 5 seasons. It's the only way to way to watch it. Here's the reddit post and a sample screengrab