Yeah exactly, anyone can suffer from the "my writing is crap" syndrome. Don't delete it, just put it aside for a while, do something else, watch a movie, listen to music then come back, maybe after you'll get this crazy new idea and you'll write a masterpiece!
That's what happens to me sometimes, I started writing Her Green Eyes Past Midnight in french, like before Xmas 2007, wasn't happy with it (damn french for its complexity, it cutted the pace and I hated it), so I decided to translate it (third person mixed with first person narration, doesn't work as well as I thought it would) then I finally told myself **** this ****, the story's in my mind, I'm just gonna rewrite it from the ground up in english. And that's what I did, and I think Thirteen, that you just loved the third and final version!
Cheers, don't give up, some times are better than others I guess, just like making love...Some times you got a headache and she doesn't...
