Turn offs

Unnecessary toning for pseudo artistic effect, (trying to make a bad print look better)
Cloning of other peoples images, styles.
Inconsistency in terms of style etc.

Poor quality, unsharp images, bad framing - unless the images warrant it
Being formulaic

Turn on's

Sense that a photographer has vision
Good grasp of technique
Believes there's no rules
Superb quality (where warranted).

That's just a start

Ian