After the bunch of downvotes in the last couple of days, I have a question. It is of course related to another one: When to vote a question down though from my opinion, the situation with answers is slightly different.
The main question is written in the title and I expect some opinions concerning it, but there are some more detailed questions.
The idea presented in When to vote a question down was to read what appear when hover mouse on voting errors:
The answer is not useful.Is it sufficient for one to downvote only based on his subjective opinion (since he already has enough reputation to downvote) or he/she should provide some comments: what doesn't he/she like, how it can confuse another reader and how can it be improved?
If there are two answers appeared with a difference in a minute and they are almost the same, should their authors leave such answers or should they decide which answer will be left. Honestly speaking, there is no objective advantages of having very similar answers to the same question. For example here: How do I find this limit? although my answer was minute faster, his answer is slightly more extended and attracted more attention from other members. That's why I was going to delete mine - but then was confused by the discussion here: When is Deleting an Answer Reasonable? This rises two questions: if you're typing the answer and see that another answer appeared though it's not as 'good' as yours, should you post your answer? If you see that after 2-3 minutes after your answer (which was, say, the first) the better answer appeared, should you delete your answer?