I have plenty of people whose skills at writing are questionable, but then again I have to remember that my writing is far from perfect and I have no room to judge them. Its a game, its about fun, as long as you and the other player is having fun then writing style or how they write in general should not matter.
Besides they always get better. They always get better when reading posts, and when they read in general. The bottom line is they will get better as long as they are playing and writing. Progression happens, and you just have to have a little patience. Besides how sporting is it to destroy a character based on OOC reasons? There should be no wanting to destroy people based on how they write, you should want to destroy them based on their character ^.^
Oh yes, and woo! Storyteller pride