Film your fights, especially when you see the person doing something you'd like to review later or to review your own performance more objectively. If you're not filming and someone did something interesting always ask who he was either on 200 or the guy who killed him or was killed by him. Pretty soon, if you do those things, you'll get a good idea of who's in what, the dangerous ones anyway. I can recognize most of the better sticks by their behavior, style and plane after the first turn or so.