I'm finding that I feel that way about some fabric. I loved it when I got it, but not so much now. I usually try to find a friend who likes it and pass it on and if that doesn't work, I'll sell it. If that doesn't work, I cut it into strips and squares for my scrap bin. Not so easy with a quilt!
I have found that when I'm working on a quilt and don't like it and friends/family encourage me to finish it I am always happy that I did, whether I like the end result or not. There's always someone who can use it and for me there is satisfaction just in following through with it. I think that depends on your own personality though; some of us need to finish and some can walk away with no problem. It's neither good nor bad, it's just you!