Top 3 Websites and Why:

http://www.perotmuseum.org.

The design is very unique and interactive. Also, everything is well organized, and you can easily find the infromation.

http://www.whitehouse.gov/

The design is very simple and pleasant. Everything is easy to follow. Also, it is well organized.

http://www.google.com/nexus/7/

It has high-resolution images. Type of font and colors are well chosen. Text is easy to read. Also, the design is unique than other websites like it.

One Bad Example:

http://www.wrdaonline.org/biography/wrdalist.html

It has too much color. No Simplicity. Text is hard to read.