How often are pieces missing from sets?

cobi · 2013-01-06T16:40:39.000Z

I am new to the Lego world, but have become hooked. I have had some issues, wondering if anyone else has. Bought Pet shop new in September, received 2 instruction book #2 no #1. Got Death Star for Christmas, and while the instruction book is impressive it was missing 2 pages. Grand Emporium came with the flower part for roof with no hole, had to have Lego send new part. Is it just my bad luck?