Top-posters have always been frowned upon by traditional Usenet
aficionados. It is considered to be very bad form.
*Some* "traditional Usenet aficionados" frown upon top-posters. Many
others (including me) do not. And some "traditional Usenet
aficionados" frown upon bottom-posters.
Personally I don't frown upon anyone just for his posting style, but I
can tell you several things concerning the way I feel about posting
styles:
1. If someone replies to a long message with a question at the bottom
of it by top-posting his answer and quoting the entire text of the
original, I have to first scroll all the way down to the bottom to
find the question and then scroll all the way back up to the top to
read the answer.
2. If someone replies to a long message with a question at the bottom
of it by bottom-posting his answer and quoting the entire text of the
original, I have to scroll all the way down to the bottom to find the
question and the answer.
Both of the above are poor ways to post, as far as I'm concerned, and
inconvenience me greatly--so greatly that in many cases, I don't
bother doing the scrolling and just bypass the message.
So my view of the best way to post replies is the following:
1. Answers should follow questions, never precede them. That avoids
scrolling down and then back up.
2. Answers should never be way down at the bottom so that one has to
scroll a long way down to find them.
3. If the question being answered is near the top of the original
message, the answer should be posted immediately after it. The rest of
the quoted material can follow the answer, or be deleted if it's not
critical to the message.
4. If the question being answered is near the bottom of the original
message, as much as possible of what precedes it should be deleted
when quoting, so that scrolling to the bottom is minimized.
5. If there are multiple questions being answered, the replies to each
of them should follow each question. That makes it clear which answer
pertains to which question.
6. If sufficient original test is deleted rather than quoted and the
answer is reasonably short, the reply to the question can either
precede the question or follow it. As I said above, I prefer the
answer following the question, but since both will fit on the screen
at the same time, and no scrolling will be required, the difference
between the two styles isn't very important
I personally think that number 6 above is the most important point.
Trimming the material quoted is more important than whether the answer
is top-posted or bottom-posted, because minimizing the scrolling
required to read the message is the most important consideration.