I flag a lot of answers as "not an answer" as they are just that. Not an answer. These "answers", or comments really, often have two distinct meanings:
- Thank you, your answer solved my problem...
- Have you found the solution to this problem yet?
The reason for these comments depend upon the fact that new users with reputation less than 50' don't have the privilege to comment, and instead posts an answer.
A perfect example of the issue is this comment posted as an answer:
Wouldn't it be easier letting new users with only 1 rep be privileged with comment possibility instead of driving them towards the answer text box?