If I'm quilting for fun or quickness I'll choose patterns that don't need matched seams like the fast jelly roll quilt (tute here on the board), or bricks or simple bargellos. But if I'm making a star block or anything else with triangles I'm very careful and slow to get the seams right. I will rip or recut and make again. However they're never perfect so I have to have a point where I will say that's the best that I can do and as someone else else has said most of the recipiants are oblivious to mistakes anyway. I've only once attempted to put a quilt into a show and now that was way too stressful for me so it didn't go and I've not done that again.