I think Twenty Twelve looks amazing compared to yours. No offence but it’s true. Go ahead with Typography tutorials, layouts, best practices. The slider is no big deal, especially if your theme sucks in terms of design.
You really need to see what makes the difference between what I’ve compared above so you can understand what you have to do to compete here. You gonna have to reinvent themes if not everything about webdesign.
Best of luck
PS: don’t bring scientology iconography in here please