I was thinking primarily of entertainment (movies, games, books, music), but I suppose it could apply to a lot of things... But do you generally find that you:

1. Have high expectations for things and are often disappointed, and also have low expectations for other things and come away delightfully surprised.

~or~

2. Expect to like things, and find reasons to back up your expectations, and therefore have made up your mind before receiving all of the facts, and in the reverse, expect not to like other things and come up with reasons to dislike something, having essentially made up your mind ahead of time to dislike it.