In my opinion the least helpful comments are number 1, 4, 6 and 7 and the most helpful comments are 2, 3, 5 and 8.

Why I believe that number 1, 4, 6 and 7 are unhelpful comments is because they have misspelled grammar, forgotten full stops and capital letters and they used short forms of writing which is unnecessary.

Why I believe that number 2, 3, 5 and 8 are helpful comments is because they used capital letter, full stops, different subjects in the comment put into two paragraphs and they are informative comments.