I like the idea of fighting styles. But I'm not sold on the mechanics in either Quintessential Fighter or Path of the Sword. The system in Oriental Adventures works well; there are a lot of requirements, and you get a one-time bonus.
I think most of the bonuses in Quintessential Fighter are pretty well-balanced. Now that we've seen so many feats in the splatbooks, Dragon, and d20 supplements, I think that some feats are not worth a feat, while others may be too powerful. For example, Tome and Blood requires spellcasters to spend one of their few feats if they want a more powerful familiar. Relics and Rituals and Path of Magic don't require a feat, but they do require higher minimum levels and may have other prerequisites as well. Also, consider that Paladins are not required to spend a feat to call a more powerful mount.
What I'm saying is that I'm all for alternate mechanics to provide abilities besides feats. But I'm leary about some of the requirements from Quintessential Fighter (especially the wisdom requirement, which is a nice idea but far too demanding in many campaigns).
I'd change the prerequisites and possibly add an XP cost. Some of the abilities are great, but should not IMHO cost a full feat; for example, choking up on a pole arm to use it at a closer range should be cheaper than a feat.