Spaces are gone and Mission Control is the culprit!
I was a SL Spaces nerd. I had my top left hot corner set to "All Windows" (which Lion killed by the way) and the upper right hot corner was set to "Spaces". Whenever I wanted to switch between programs, all I had to do was move the mouse to the uppper right corner and my six spaces came up, each space had programs assigned to that space via system preferences and if any space was too cluttered, all I had to do was move the mouse (to the upper left hot corner) to see all the windows, WHILE in the Spaces view. All this capability is gone. Mission Control $uck$!
As for Dashboard, it was assigned to the bottom left hot corner and was quick and pretty. Now some of my widgets dont display color correctly and that grey Lego background is horrible! At least give your power users the option to keep the previous features!