B5 is fantastic.
I watched In the Beginning
first and yes it was spoilerish but it was so damned cool it got me hooked.
Season one can be slow at times, but having seen ItB
first I knew that there was going to be a hell of a lot of awesome coming my way if I stuck with it, and sure enough, not only was I not disappointed, I was blown away.
B5 is a classic and one of the pinnacles of sci-fi TV.