While I'm reviewing posts on Ask Ubuntu (but it is not particular to that site), I can see comments posted as answers because their author doesn't have enough reputation points to comment.
Is it good to mark "No Action Needed"?
Or better add a comment or flag post as "Not an answer"?
If it's truly not an answer then should be flagged as such.
If the moderator who sees the flag is feeling generous and the "answer" is a good comment they may even convert it to such despite the fact the user doesn't have enough reputation. On Stack Overflow this is rare though.
Just because the phrase
I don't have enough reps to comment, so I'll answer
or a phrase like that is in the answer, does not mean that it's not an answer.
I've actually ran a query searching for posts that included phrases like that many times before. I can tell you that more than 60% of the time , it is an actual answer, and should not be deleted or flagged as Not An Answer.
So you must read the whole answer. Does it try to answer the question? If so , then just edit out the useless phrase of "not enough rep, so I'll leave an answer" or whatever, and upvote/downvote if you want.
If it really is not an answer, then flag it as Not an Answer, and downvote if you want.
I suggest reading this absolutely brilliant post by Shog on when an answer is and isn't an answer Your answer is in another castle: when is an answer not an answer?.
LPT: If you're pressing "No Action Needed", you're not working hard enough.
You should find something to do.
