I never understood the attraction to B5. The aliens were cartoonish. Couldn't take it serious. Ranked right down there with the original Battlestar AFAIC.
Now, a truly great SciFi show that cut way too short was Space: Above and Beyond. The writing was actually about the people, as it should be. Looking back it reminds me of a cross between Star Ship Troopers and BG2.
I liked it too, but it was not on very long.