I think No. 4 is the least helpful because there is no Dear _____, and the punctuation and spelling hasn’t been cared about
I think No. 7 is next because your more like commenting to a youtube video and being informal.
For me No. 1 is the next baddest comment because he or she isn’t using the right gramma and isn’t using real words
I think No.6 is the next worst because she is not being very formal i rate this one