Is contemporary (Western) Hatha-Yoga as potent as traditional Hatha-Yoga?
The answer to this question again depends on which school or style one is talking about. But contemporary Western Hatha-Yoga does not (yet) appear to have given rise to great adepts like Matsyendra or Goraksha, which does not mean that this could not happen in the future. Even accomplished Hatha-Yoga masters like B. K. S. Iyengar, who does not consider himself a realized adept (siddha), have so far not emerged in the West.