I've always been of the Bruce Lee school of thought that the best fighter is the one that's still standing, regardless of background in martial arts.
Anyways, here's a little but of what I've learned over the years. I started with Jeet Kune Do a loooooooong time ago and did that for about 7 years before I left Singapore. I started young and ended young, so most of the actual techniques have been lost on me. But the philosophies, however, still stick around. For example, the whole "be like water" and "do not think in a fight, react" statements.
Just fairly recently (few years ago), I picked up Iaido, specifically the Muso Shinden Ryu style. For those of you who are unfamiliar with that art, it's the art of drawing the steel sword, the stuff you see in samurai movies and most recently the Last Samurai. It was because of the creativity and flexibility in actions that I learned from JKD that I was able to rise through the ranks fairly quickly. Before I made my most recent move for graduate school, I was of the 1st kyu rank, one below the level of dan rank, which is the master rank (black belt equivalent if you will).
Almost every martial art has a real-life application, so the stick to one style exclusively because of arrogance is foolish. I think we've all come across people like that before. You know, the ones that make the statement that style A is better than style B just because they're doing it. Frankly, it annoys me when I hear that, and I've personally had to, uh, "demonstrate" some weakness in their style. But overall, I just do martial arts to have the, sound mind, confidence, and knowledge that I can, if necessary, at least provide some sort of protection against an assailant.