I truly truly doubt it's a writing quality issue. :( But it really does SUCK to get a lack of feedback on work you cherish and put so much hard effort into. The majority of my writing before last year got almost zero feedback in general (and I'm talking nearly...um...4-5 years of publically accessible fiction), and it gets so discouraging - and yet I look back on some of those stories and I really don't think they're any lower quality than what I'm writing now. So it's just hard to know why some things get comments and some don't. Sometimes it's time and place, and I think reaching your audience - I didn't know most of my readers were Tumblr folk, until I got a Tumblr account. Will Terrell (the Youtube video dude) might help, he's a sweetie, and he just wants to remind you (and other creative folks) to stick out the tough parts.

And thank you for putting up the link!

Also, with your work being fully original - I don't know if you've been doing it, but consider listing it on Goodreads when you feel so inclined. :) This is legal and within their ToS - and as long as the stories are *complete* (or complete within a series) and about 10k words or higher, you can start linking back to your work and increasing its profile. A lot of people don't know they can do this (you can do it with completed fanfiction too, actually - I checked), but it's a good way to just sort of...increase your profile. So anyone who is searching certain titles or authors will come up with your work there too. :)