I wouldn't take it apart and fix it. These are the options I see.
1. Someone will love the quilt and not know all the errors you see. Most quilt guilds make charity quilts. You can contact one of them and donate it as it is. They will quilt it and donate to someone.
2. You can just quilt it as it is and use it as a utility quilt....the one you use to put on the ground, wrap Grandma's dresser in it when you are moving it, etc. Or give to the dog to lay on.
3. Or you can use it as a practice quilt, to try all different types of quilting on.
Personally, I'd just find a guild and pass it on.