Technically, My Writing Is Awful
Well, the last week I have been quite ill, but I have also been working very hard on getting something published. One of my smarter friends reviewed an earlier version of my work, and had this classic comment:
your ideas are excellent. i am as impressed as i expected to be. technically, your writing is awful. i say this out of genuine concern. you should take a remedial course.

Ouch!

Update: I tried defending myself by arguing I am just careless, and that my writing is quite acceptable when I bother to review it. My friend had none of this:

i'd like to see some writing you've done that you've checked carefully. then i would be able to know if you really know how to do it.... i don't mean to pick on careless errors. i would never even be able to write a draft that looks like what you did. it also shows a basic ignorance of some simple grammar rules you have never been taught because of inadequate schooling (and a gigantic lack of interest i suspect). but that's your deal....

Big Ouch!