My rejection letter was full of detailed criticism - what does this mean?

My rejection letter was full of detailed criticism - what does this mean?

Alexandra Pringle (Editor in Chief) gives expert video advice on: My rejection letter was very short - what does this mean?; My rejection letter was full of detailed criticism - what does this mean?; My manuscript was returned really quickly - what does this mean? and more...

If you've had a long rejection letter from the publisher, it means you are very lucky to have had that feedback and you should take it really seriously.