The best login screen ever was the one for 9.04, I can best describe it as one text field and you entered in your user name then pushed enter then it asked for your password. Was a little more secure locally and the background image for the login screen was also pretty rad. Anyone know how to change it?
There's a guide on how to change the login screen background here: http://maketecheasier.com/change-login-and-boot-screen-in-ubuntu-lucid/2010/05/13 and it's also possible to do this using Ubuntu Tweak
I'm not sure if it's possible to revert completely back to the 9.04 login screen since it worked in a different way to the one in 10.10 and 11.04, but it is possible to make it require you to type your user name like in 9.04 by going to Login Screen Settings and unselecting "Show list of users"