Overall, I have to admit, this is a great read, even if you aren't going to use it to play B5. All the sorts of information you ever wanted about Minbari and presented in a fairly clear and easily understood manner.
That said, there are a few small quibbles that I have with it... There are a couple of points where somethings described and has the addendum "look at the .... feat in the characters section" but when you check ..there are no mention of those feats. Which begs the question, were they cut for space reasons and no-one took out the pointers to them, or did they just go missing... (said feats being the "Mol shent Va" and the "Tur Andayr").
The concept of Minbari "drow" thats been kicked around in other places on the forum, so I wont add to it apart from saying interesting, but flawed.
The other main question, prestige classes the "Alyt" .. why? It seems to be just all the class abilities of the standard Officer, but pressed in to a 10 level prestige, with just the added bits of contact with the Grey Council for local "flavour". Since the Warrior Caste have Officer as favoured class, and those abilites don't look like they stack.. It seems like a prestige class done just to say hey look, another prestige class...