I agree with every one else. Nothing wrong with hand tying a quilt. They are very soft and cuddly feeling. For me, some of my ties didn't stay after many many washings.
And as for using the machine to tack them, this is what I did. If you have a machine with fancy stitches, set it so it will do a single motif of the stitch and then do them instead of the hand tying. I did one with little hearts, turned out cute.