When my brain is trying to anticipate what will be the best experience for dinner on Friday night I am aware of a mixture of expectations for each option I consider.
Some of the expectations are rational: The semi-expensive restaurant I like is extremely consistent in quality and I know that the food will be cooked with precision using expensive tools and modern techniques, resulting in a higher quality entree (and better experience).
At the same time, some of my expectations about the restaurant are irrational. For example, I can identify feelings that they food quality will be much better than at similarly rated restaurants that I have not visited. Having visited the restaurant several times I'm now afflicted by mere exposure effect, among other cognitive biases.
I don't think of myself as being a super-rational machine, but I know that just following my intuition alone when it comes to expectations is not going to yield the best future experiences.