Small creeks do not bother me. But when the gaps get huge like the image a few posts back
Some of that is due to the butt simple justification used to accommodate reflow .
What really jars me is the use of wrong words (homophones and such). Come on editors, if a 'D' student spots these with great regularity in e-books, someone has dropped the ball as this was RARE in a print version.
(another peeve is technology errors, but I will give the editor a
pass on most of those)