Overall, I am disappointed with itunes 11 versus the previous version. Furthermore, I am becoming increasing disappointed with my overall Apple experience.
I am a relatively new convert to Apple. Over the last few years I have made a full transition - macbook pro, iphone, ipad, etc. I have typically been impressed with the engineering involved in Apple's hardware - well designed, attractive, easy to use, etc. (although I expected more from the iPhone 5).
The continued system (or version) upgrades seem more frequent, and Apple seems to be less concerned with the end user. The upgrades seem to be less user friendly compared to previous versions, and/or require more of a learning curve to navigate through the changes, and/or eliminate key features. Most of the time, the elimination of features is not noted in the upgrade synopsis. I would not have upgraded to itunes 11 if I knew that cover flow had been eliminated, and it took me some time to figure out how to restore the side bar. Nor would I have made upgrades to other Apple systems if I fully understood the changes that were occurring with the upgrade (recently had to buy a new printer because an OS upgrade caused problems using my prior printer).
Apple knows they have superior hardware (although other companies are catching up), and regarding existing users, Apple knows they have a captive audience (relatively speaking). For example, it would be cost prohibitive for me to transition back to PC/Android based hardware anytime soon. Apple knows that these upgrades have little impact on new consumers looking to purchase Apple products, and Apple knows that if they upset existing users, there is little risk of an exodus. As a result, I believe Apple doesn't consider the impact to existing users when contemplating system upgrades. This may impact Apple in the long run as user's hardware becomes obsolete. I probably wont need to upgrade my hardware for a couple of more years, but when I do I will consider other options if Apple doesn't modify their overall strategy.
I suppose I will have to research future upgrades before immediately downloading. However, I have typically associated upgrading with improvement. Recent experiences with Apple have proven to me that this is not the case.