I would agree that vinyasa isn't for beginners, just because the teacher can't possibly check everyone's form closely when you're moving quickly from asana to asana. I'd recommend Iyengar or Anusara for a place to start.
+1 also that holding a standing or balancing pose can be very strenuous. Still, while there's a very valuable place where you hold through the fatigue and find strength in a pose, no one should ever feel pressured not to drop into child's pose or downward dog when they need a rest.
Speed comes from what you put behind you. - Judi Ketteler