You ever notice that most stories about "What a bad time I had at this Thing that was supposed to be Fun" start out with some variation on: "So I had these (insert unreasonable expectations)..." and end with "... I couldn't believe how awful it was! I am so surprised!"
... btw: I include myself in this comment upon humanity.
It's true that expectations are the root of all disappointment, but I think that's kind of like saying being alive is the root of all hunger. True but not useful. Unreasonable, poorly educated or just plain damn picky expectations are the root of a lot of disappointment.
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High hopes...
Low expectations.