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.

TNG was using mainly practical effects early on, which had benefit of higher visual quality but meant not as much could be done within the budget.

Babylon 5 early and very enthusiastic use of CGI meant that the scope of what it could see was ridiculously bigger without reusing clips as much as some other places did.

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.