...is it me, or does this shit need some serious re-working? If the tables speak true, why would anyone ever bother using a weapon? You can easily make a martial arts style that attacks twice a round for 1d8 damage and gives you AC equivalent to studded leather. Unless, of course, you are playing with the weapon type vs. AC rules, because I'm fairly sure bare handed attacks get a nasty penalty to hit any type of armor.
In all likelihood, since I never play with weapon type vs. AC mods, I will adjust the damage of martial arts down by one point each and say that the total damage rounds down, so that the only way to do 1d8 is to take a purely offensive hard style. (Since even a striking hard/soft combo style would only net you a 7)
Another thing to think about, however, is that I don't think you can do martial arts in armor... and those high offensive styles are going to leave the fighter with an AC of 7-8. (Unless he's using a soft style, in which case he's going to have high AC but do very low damage and have only one attack per round, the horror.
Yes another thing to consider is that, unless I missed something, only monks and some kensai start out with martial arts... monks it is obviously built into their class, and kensai can specifically choose a martial art as their weapon of choice. The only other rules about martial arts, from what I read, involve a long and arduous process of courting a master, plus the willingness to drop proficiency slots, which don't come around that often.
Perhaps martial arts rock so hard because your chances of learning them are fairly slim.
If anyone out there has played with the OA martial arts rules as written, please feel free to leave feedback. This isn't going to become an issue anytime soon, but I like to have my house rules for a game nailed down before I ever run it.