It seems that more and more comments are becoming the place to put answers in. Since you cannot mark a comment as a correct answer you are losing that valuable flag.
Also since new users cannot add comments they are the only ones actually leaving answers.
However since comments are not counted in the answer count, you can have very valuable information in the comments for some answers and it will show up as 0 answers, while for a different question where a new user (perhaps not as expert as the regulars) leaves an answer and that question gets shown as having many answers.
Clarification:
My basic point is not that it is inappropriate to leave comments - rather that since newbies have to wait until they get 50 Rep before they can comment , they need to leave answers - however they are newbies and they are perhaps not as knowledgeable as the regulars who leave comments.
What I am thinking is to let the newbies leave comments so that they don't have to leave questionable answers and skew the numbers around