Film critics (like politicians, sadly) hold themselves in a higher regard. There is a certain mindset after you watch and articulate your feelings about hundreds or thousands of films. There are many books on the subject about what a critic should consider, but the privilege of the critic is in getting the experience itself.
I try to look at the finished product (“the whole being greater than the sum of the parts”), but I also take into consideration what it is that’s being promised. Like a great meal, someone has to plan out all the ingredients, assemble them, cook everything together, and present the end result; there’s effort there, and that effort should be acknowledged. Sometimes it works and sometimes it doesn’t, and whether you’re critiquing food or film, an informed opinion will always be based on previous experience. However, if you offer me a steak dinner and serve me a cheeseburger, we’re going to have a problem. Likewise, there’s nothing inherently wrong with a good cheeseburger (because sometimes that’s exactly what you want).