I am proud to say that I have done my fourth lengthy review for a song. If you need serious critique on music, I would be absolutely thrilled to judge it.
One thing- I am only good with Classical and Jazz. I will refuse to do rap (which I find the easiest form of music to write because you need virtually no music theory skills since the melody is chanting), but will do classic rock and pop , and maybe modern rock... though I don't advocate it or like it much.
My reviews generally are about 3,000 characters long and cover everything from giving you praise for good bits to constructive criticism and ideas for arrangements or modifications. I generally spend between 10 and 30 minutes on any one review and do one about once every week or so.