I think the biggest disconnect between critics and laypersons, is the ability to appreciate fluff.
I know Bob harbors particular hatred for Transformers, so i'll go with that. The plot was ridiculous, and the acting was atrocious, but i still enjoyed them (the second less so than the first) just for the visual spectacle and energy. Movies like transformers, Pirates, or Avatar are the cinematic equivalent of a fireworks show. They're bright flashy and exciting but when stop to think about them, they're shallow and all functionally identical.
Film Critics, by and large, seem to be unable to appreciate the spectacle. After all, I only see fireworks shows a handful of times a year, I'm sure if i had to watch them every day i'd be pretty damn sick of them too.
The issue i have is that too often critics toss this by the wayside as they go about eviscerating 'popcorn flicks.' Its all a matter of tone, there is a certain point where reviews begin to feel like their belittling anyone who may have liked the film despite its lack of artistic merit. No-one likes to feel insulted, we need to try and maintain a mutual respect for one another.
I respect that Bob is going to despise Transformers 3 with every fibre of his being. I only hope that when the times comes for him to review it, he can respect that I will be going to see it, and enjoying the fireworks.