The best that you can do, or that I can do, may not be equal to the best that someone else can do. In a group (or guild) quilt that is to be donated, those of us that actually put the blocks together for the quilt, try to make those obvious corrections, but beyond that all you can do is ask for the best that one can do. Perhaps if you know who is having trouble with 1/4" seams, etc. you could offer a tip or two to help them out. Hopefully you have a very tactful diplomat that can accomplish this without hurting feelings. Good luck to you, but I think you will have to live with it