I totally know how you feel. About half way through a project, I don't like anything about the quilt. That leads to a lot of UFO's. (Over 30 and growing) I do find, just like most of the others, that even if you don't like it, if you just leave it laying around, someone will come in and just fall in love with it and the project will find it's own home.
FYI...I used to sew garments for myself. I had the same reaction half way through those. I didn't like them, knew they were going to turn out bad and just didn't want to finish them. I stuck in there, finished the garment and when that last hem was done....Wallah!!!! I liked them again.
At the very least, keep detailed pictures of the quilt with a date that you did it, so that you can come back later and see how you have progressed. Another thing, I have found that I like the finished project a whole lot more after I get it washed. The slightly puckered, wrinkled fabric adds a charm all it's own.