As noted in the description, this appears to be based on the Warblade class from the 3.5 Book of Nine Swords. However, since I haven't read that book as of this review, I'm judging this strictly on its own merits.

The Warblade honestly feels like something that should have been built as a new class, an alternative to the core fighter - it feels pretty dense as a subclass, since it essentially contains five sub-subclasses (disciplines). The presentation of this product could also stand improvement. There are a number of minor formatting issues throughout that get in the way of clarity and readability at times. Furthermore, they don't provide much flavor to sell you on the core class (which, again, just sounds like an alternative default fighter) while the themes for the five disciplines are probably over-described and would have benefited from a tighter focus. This honestly put me off the Warblade at first, because I thought I was in for something both dull and overcomplicated.

However, as I read through the subclass, I found myself liking it more and more. Essentially, this is a battle master on steroids, a fighter that can pick and choose their stances and exploits during a battle like a spellcaster picks and chooses spells. The number of options presented can be a little overwhelming, but not really more so than looking through the spell list. As for the stances and exploits themselves, most are pretty neat (besides Fountain of Blood, which should have been toned down), if occasionally much fussier with the bonuses that we usually see in 5E. That said, this definitely isn't for a player who wants a straightforward martial character - it's for players who want and plan to use the class's tactical complexity.

In summary, this is an interesting class, once you get past the minor issues with its presentation. Though it would probably work best as a replacement for the core fighter options, rather than playing alongside them.