I use all the pre-cuts-I do cut them and sort them and play with them. I have 4 quilts in progress right now with pre-cuts. The biggest problem is ME!!! I do enjoy shopping for fabric and I do cut my own patterns-but I can be as wonky as anything else!
I love the MSQC 'deal' and have quite a collection. I also make my own 'kits' with yardage.
A straight line can be harder than anything else to achieve!!
I guess my wonky sewing makes up for any wonky cutting!!! LOL