Baby Love?

With digital publishing coming out, I've been seeing a lot more covers. And unfortunately, not all of them have been of quality.
I'm a visual person. I like a pretty cover. I think first impressions make a difference and whilst the cover is not relevant to the quality of someone's writing, a picture can convey a thousand words.
Now, something that has always intrigued me is an author's response to their covers. It's very rare that an author hates their cover. But dodgy covers aren't as rare as these responses.
So what is it that makes these authors blind to the blurry images and bad photoshopping? It is Baby Love?
Now, I'm going to be blunt. I was an ugly baby. But in my mother's eyes, I was gorgeous. The fairest in the land (I was so fair in fact, I was bauld for the five 2 yrs of my life. And she entered me and my twin sister into many photo competitions. My mother, of course, couldn't understand why we never won.
So what do you think? Are writer's suffering Baby Love? Does their love of their stories and the dream of being published blind them from realizing the faults in their designs? Or are they just saying they love them in hopes of convincing others?
Would you tell your writer friend that their cover sucks?