I'm very sure there are guys out there that use Ubuntu for it's great open-source applications but don't really like the look and feel of Ubuntu. If you are new to the Ubuntu community this can be very frustrating.
While browsing the internet I came across this Ubuntu Theme. If you install it correctly it will make your Ubuntu installation look very much like a Windows 7 distro. The installation steps are written over there.
Now you can have a nice looking piece of operating system and the advantages of using an open-source application.
Before anyone says that a linux user should never install a theme which looks like Windows/Mac I want to say that it's the user's choice what theme they like and feel more familiar with. Remember that you also installed Ubuntu and maybe wanted a more great looking interface.
Looking for something else? Try Mac4Lin, it will make your Ubuntu look like a mac in no time!