They are amazing cameras. One of the best systems ever made IMHO.
They aren't very good if you like fast lenses. And they aren't that good if you always hand hold (especially with longer focal lengths).
But, I would have a hard time recommending any other medium format camera to someone who can work within these limits.
For better hand holding ability and faster lenses, I'd go with Hasselblad, Mamiya 645, Pentax 645, or Bronica (SQ or 645).