I watched B5 1.5 times. I loved it, the show was amazing. The amount of foreshadowing was amazing, things that resolves in later season whose seed were planted in early season was just amazing.
That said, the production value are low, both for special effect and cast. While there were some good acting, there were quite a few that were cringe worthy. When I tried to rewatch it a few years later...the acting more than the special effect got to me, and I stopped during the second season I think.
Then there the issue with the last 2 seasons, essentially the show was supposed to be cancelled after season 4, so they rushed the story to conclude it by the end of season 4 instead of 5 which showed it was rushed a bit. When the show wasn't cancelled they essentially wrote a new story for season 5 that had little to do with season 1-4 and season 5 was noticeably inferior to the previous 4.
Still is one of my favorite show of all time.