I don't care if your order is complicated or large. As long as you're polite, patient and friendly I am happy to take that extra bit of time to do it for you, how you want it.
Really, I'm happy to put your chicken into separate bags, or bag your bacon into weighted amounts for you.
My best/worst was six kilograms of chicken necks in half-kilo bags... made even better since it was three days before Christmas and the deli was crazy busy.
I'm not too good with the slicer, but I will shave you fresh meat... unless you demand that I slice a dozen pieces, a dozen different thicknesses, before you decide that its 'just right.'
My other hate is people that want to taste everything before they buy it.
Sure I'll let you try a bit, but not it I think your treating it as a restaurant!