Not so much disappointment as I just don't like it... In order to be disappointed you have to have high expectations or any expectations for that matter, I'll look at reviews of tobaccos when I try something new, but i don't take them as gospel since we all have different tastes. Also since I've been smoking for about 25 years, I've come to realize the flavor profiles I like... SOOO I generally like most of the new tobaccos I try. It helps I'm quite forgiving with my tobaccos :P
I also agree that your immediate reaction to a tobacco is not your best assessment, we all know that sometimes certain tobaccos pair up better with certain pipes, also your mood and environment have allot to do with it. That's why you need to give it a few bowls at different times of the day in different pipes ... Number one reason I used to keep a tobacco diary, I haven't used it in years as I mentioned, I now know what I like now.