It was lauded for being made on Amigas. The Season 1 CGI really is rather rough compared to TNG, never mind DS9. But it improved considerably in S2.

Still, there are things like the starfield visible from C&C’s observation window never rotating because it was apparently too expensive to greenscreen it (presumably an actual physical rotating backdrop was also not feasible for whatever reason). On the other hand, I think B5 was the first TV series to use greenscreening to create large interior spaces like ship hangars.

One issue w/sci fi is that sci fi takes place in the future and/or has advanced technology then it is more likely to look dated than a typical sitcom where the sets are offices and living rooms.