As others before me have said, B5 is amazing despite its many shortcomings. And for me personally, it comes down to the writing as well.
The writing in B5 - though sometimes unsupported by proper costuming, sets, FX and even good acting - is masterfully constructed. Others on the board have already voiced their support for JMS's writing and show-running of B5, with good reason.
IMHO, the writing in B5 is more consistently human than in Trek. That's to say that, overall, the human conditions of duality, fallibility, vulnerability, vice and short-sightedness are more prevalent in B5 than in Trek (excepting most of DS9, parts of VOY, ENT and First Contact). Also, IMO, the overt inclusion of money and spirituality in B5's Earth Alliance is far more realistic to the UFP.
And also, O'Hare's Sinclair was incredible in season 1, so stick with it. He has some really good moments.