I don't play tournaments but in my experience, the best Cammy players I meet fight like the best Vega fighters using speed and rolls to keep the opponent guessing before pulling off a throw or special. I can only imagine what a top tier would look like.

Guile is another where I haven't seen a real good player in years. Even the computer still tries to play him with his old Sonic Boom/Flask Kick trap. I just haven't seen anything interesting out of him in years.

As for "turtling" in SFIII, I find the characters move sets have been altered for a more aggressive style of play. I know parry can be cheap but unlike SC's parry system, I feel SFIII's can be used against an opponent as well. Its not just infinite defense. Granted, I don't feel its perfect either...