Respectfully, Steve, you seem to have a fairly narrow idea of what does and doesn't constitute a martial art. Is tai chi less of a martial art because it's practiced primarily for healing and meditation? What about pankration? We could just as easily eliminate krav maga and systema, since neither are particularly artistic....
Ah. There's the source of the conflict here. You believe my definition of "martial art" is wrong. That could explain why your comments regarding MMA strike me as very odd.
In the interest of keeping it simple, I'll say that my definition of martial art involves only a couple of things. Demonstrable martial skill learned as a part of a coherent fighting system. Really, that's it in a nutshell. If you are learning something that can be summed up with one name, and you are learning martial ability that you can reliably replicate, you're learning a martial art. Whether you're learning an effective art or not is beside the point. So, as far as I'm concerned, Western Boxing is a martial art. Krav Maga is also a martial art, as is Muay Thai, Wing Chun or Kyokushin Karate. Fencing is also a martial art, and we can also include Arnis/Kali/Escrima, too.
Tai Chi is, at best, debatable. If someone could demonstrate martial ability strictly from having trained Tai Chi, I'd buy it. If you allege that someone can, I won't call you a liar, but I've never had that happen. If you want to believe that Tai Chi teaches demonstrable martial skill, I won't stop you.
That's one way to look at it, but I don't see the point in excluding our equally dedicated brothers and sisters.
There's a problem with being too inclusive. All of the same qualities are present in someone who becomes an expert at playing the piano. Dexterity, dedication, technique, art, and all through years of applying oneself to the development of expertise. What's the one difference between a musician and a martial artist? The specific skill set learned in martial arts is combative. The skill set learned on a piano is musical.
Honestly, budomartialarts, I'm having a hard time tracking the conversation. On the one hand, you make some sweeping generalizations about various styles. I believe that your rock, paper, scissors analogy is grossly oversimplified. On the other, you're chastising me for being too exclusive.
For what it's worth, I stand by my statement that XMA (and Wushu) are more performance art than martial art. Often, the practitioners of XMA or Wushu also study a martial form, and I've already said that the skills can be adapted.