As a counterpoint, I regularly find my intuition is wrong, and to some extent I think human intuition is wrong systematically. The people who make the best first impression almost always seem to be worse when you get to know them, and people who make a poor first impression often just think more and take time to understand. If you're in an industry where first impressions are most important (like sales for example, I think they never really should be) then maybe your initial impression is a good measure, otherwise, don't judge a book by its first few pages