A couple of things really, mate.
When he says your writing could use work, is that all he said?
because that's actually quite vague. Maybe it's just me but if i ever leave any critique on someone elses work, keeping in mind they could of spent hours and hours on it, i at least give them something to work with?
For example. supposing it was me saying it I'd put.
"Oh i think your writing could use some work - i'm referring to several points in part 6 and parts 7, 8 and 9 that didn't quite work. I don't think He-Man would of done this and even if he made it in time such and such a person could of intervened."
^ maybe not my best example but my point is that if people are to criticise, at least give reasons. I dont think 'your writing needs work' is as pinpoint or accurate to help you at all, and i always think criticism should be backed up with points to help the person improve for future works.
But your spot on with what your saying about it being subjective, any form of artwork or entertainment is subjective. Doesn't matter if its music or film or videogames. The exception would be taken is if he's referring to grammatical errors or spelling. In which case he should still point this out if that's what he's truely meaning.
I've read a few of your series and liked some of them. I probably don't get round to reading every one of peoples stories due to commitments elsewhere but from what i have read of yours i've enjoyed it.
