One of the things about Will that I enjoy the most is his skill with the sword. Orlando is incredibly talented in that regard, and he really brings that through his character. Will Turner is phenominal and I love to watch him fight just because he's so darn good at it.
One of my favorite bits in DMC and Will's swordfighting is on the roof of the church, where he and Norrington are swinging their swords at Jack and they are ducking in and out of the way of each other. That is awesome.
Another thing I like about Will is how open he is with his feelings, though I suspect that he will become more introverted to protect himself in the third movie.