For the most part, deleting the App is sufficient and is the standard uninstall for OS X
Any residual files are miniscule and are not a problem at all
They take up virtually no HD space and do not affect your system or drain resources
Some Apps come with their own uninstaller and that is the preferred method
This is not Windows, and you do not have to be paranoid about stripping your system
Honestly, it is not an issue
Woof, Woof - Dawg