1) Preview 6.0 has lost its 'Hand' tool! So, if you're not on MacBook Pro with touchpad, you can't actually pan around open document, not depending on document type. 2) Safari 6.0 has lost 'Activity' window, which allowed you to download video from YouTube for example. Any thoughts? Besides, the system is crammed with plenty of useless features, which make it much more heavy and awkward.