We all know unity sucks. This part is already dealt with here. Now one option is to install Gnome 3. which is dealt with here. Another option is to install Cinnamon. It is a standard Desktop environment supported by LinuxMint. Cinnamon is based on Gnome 3.4 but it uses a task bar like interface instead of Gnome Head-On-Display. It is stable and it works fine. At least worth trying once. To install it open terminal and type following command to install PPA repository
sudo add-apt-repository ppa:gwendal-lebihan-dev/cinnamon-stable
(Say yes at next question. Please note the 'stable'. There is an option to add Nightly version but those are unstable.)
Now update the system with following command:
sudo apt-get update
Finally install the Cinnamon by typing following command:
sudo apt-get install cinnamon
Choose Cinnamon at next startup. It will boot into Cinnamon. Happy computing Linux. Never give up.