When the product is touted as a vast improvement by the manufacturer and critics, that's info. I read the info, tested iTunes 11 on my laptop first because it doesn't have a large library like my iMac does. If there was a problem with the software then I wouldn't install it on my main machine. My mistake was not checking more throughly the features or lack of features. No one in the professional world had yet said not to install iTunes 11.
What folks are so irate about is Apple didn't say anything about taking out features and changing the player so drastically in navigation. It's now too simple.
Also, I personally am upset at all the reviewers who tested iTunes 11 and approved of it without really testing it against version 10. Most just seemed like they dallied for a few minutes, figured, it didn't crash, it's fast, what more could you ask for? No one really delved deep into it until a couple days later when negative reviews started coming in.
It was exactly like the reviews of Windows 8. When Win8 was first released, you couldn't find any info on what changes took place, compatibility with older programs, the dropped Microsoft Mail program -- only how cool it looked and yes you really should buy it. This kind of poor research makes me wonder if I should even listen to critical reiews.
The lack of real feedback in the first day or so made it hard to figure out that iTunes 11 was in reality a stripped down music player with little useful navigation features. Before you go and say "You should have read the info first", remember that iTunes 11 did not come with a manual. Only Apple's word for it and the reviews.