i understand completely. been there more than once.
if you announce a decision to chuck it into a dumpster, many will try to talk you out of it. if that's what you want to do, then do it. why make yourself miserable?
if you decide to keep going with it, don't think of it as finishing the quilt, per se. use it as a skill builder. consider it practice as you proceed through the remaining stages of construction. make or take notes about which results didn't please you, and why you think it went wrong. what you learn will be worth what feels like drudgery. you can apply all the lessons to future projects and will be happier about them.
toss it or learn from it. whichever idea makes you smile and feel some relief is the right idea. ;-)