I've checked the package without installing, and it won all the red marks. It replaces almost all the most important files for any Debian distro without regards. Here's the main problem:
cat debian/postinst
#!/bin/sh
set -e
if [ -d /usr/share/waha/adjustments/ ]; then
cp -R /usr/share/waha/adjustments/* /
fi
exit 0
it tells that all the files in /usr/share/waha/adjustments/
are copied to the root of the filesystem without checking before hand and no way to remove them securely. The best option is just to backup everything and reinstall the system.
List of files that get replace without previous confirmation:
/lib/live/config.sh
/usr/lib/pymodules/python2.7/UpdateManager/DistSpecific/WahaLinux
/usr/lib/pymodules/python2.7/UpdateManager/DistSpecific/WahaLinux/__init__.py
/usr/lib/pymodules/python2.7/UpdateManager/DistSpecific/WahaLinux/changelog.py
/usr/share/locale/ar/LC_MESSAGES/add-ar-keyboard.mo
/usr/share/locale/ar/LC_MESSAGES/check-live-installer.mo
/usr/share/software-center/softwarecenter/distro/WahaLinux.py
/usr/share/waha/check-live-installer
/usr/share/waha/add-ar-keyboard
/usr/share/icons/debian-installer-launcher.png
/usr/share/icons/gnome ## several logos and svg files
/usr/share/images/desktop-base
/usr/share/images/desktop-base/joy-wallpaper_1920x1200.svg
/usr/share/images/desktop-base/joy-wallpaper_1280x1024.svg
/usr/share/images/desktop-base/joy-inksplat-wallpaper_1920x1080.svg
/usr/share/images/desktop-base/joy-wallpaper_1600x1200.svg
/usr/share/images/desktop-base/login-background.svg
/usr/share/images/desktop-base/joy-grub.png
/usr/share/images/desktop-base/joy-wallpaper_1920x1080.svg
/usr/share/applications/libreoffice-impress.desktop
/usr/share/applications/libreoffice-xsltfilter.desktop
/usr/share/applications/uninstaller.desktop
/usr/share/applications/libreoffice-calc.desktop
/usr/share/applications/debian-installer-launcher.desktop
/usr/share/applications/gnome-terminal.desktop
/usr/share/applications/libreoffice-startcenter.desktop
/usr/share/applications/libreoffice-math.desktop
/usr/share/applications/libreoffice-base.desktop
/usr/share/applications/mimeapps.list
/usr/share/applications/wine-winetricks.desktop
/usr/share/applications/mimeinfo.cache
/usr/share/applications/wine.desktop
/usr/share/applications/libreoffice-writer.desktop
/usr/share/applications/libreoffice-draw.desktop
/usr/share/applications/wine-browsedrive.desktop
/usr/share/applications/supertux.desktop
/usr/share/applications/winecfg.desktop
/usr/share/applications/show-desktop.desktop
/usr/share/pyshared/UpdateManager/DistSpecific/WahaLinux
/usr/share/pyshared/UpdateManager/DistSpecific/WahaLinux/__init__.py
/usr/share/pyshared/UpdateManager/DistSpecific/WahaLinux/changelog.py
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/schemas/org.gnome.shell.extensions.dash-to-dock.gschema.xml
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/schemas/gschemas.compiled
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/prefs.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/extension.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/myDash.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/convenience.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/stylesheet.css
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/intellihide.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/dockedDash.js
/usr/share/gnome-shell/extensions/dash-to-dock@micxgx.gmail.com/metadata.json
/usr/share/python-apt
/usr/share/python-apt/templates
/usr/share/python-apt/templates/WahaLinux.info
/usr/share/python-apt/templates/WahaLinux.mirrors
/etc/skel/ #most of the skel files
/etc/apt/sources.list ## Important
/etc/apt/sources.list~
/etc/apt/sources.list.d
/etc/apt/sources.list.d/wheezy-backports.list
/etc/apt/sources.list.d/sarab.list
/etc/apt/sources.list.d/iceweasel-release.list
/etc/apt/preferences.d
/etc/apt/preferences.d/wheezy-backports
/etc/samba
/etc/samba/smb.conf
/etc/gdm3
/etc/gdm3/greeter.gsettings
/etc/alternatives
/etc/alternatives/start-here-48.png
/etc/alternatives/start-here.svg
/etc/alternatives/start-here-22.png
/etc/alternatives/start-here-256.png
/etc/alternatives/start-here-24.png
/etc/alternatives/start-here-32.png
/etc/alternatives/start-here-16.png
/etc/network
/etc/network/interfaces
/etc/modprobe.d
/etc/modprobe.d/alsa-base.conf
/etc/adduser.conf
/etc/lsb-release
/etc/NetworkManager
/etc/NetworkManager/NetworkManager.conf
/etc/issue
/etc/xdg
/etc/xdg/autostart
/etc/xdg/autostart/tracker-miner-fs.desktop
/etc/xdg/autostart/tracker-store.desktop
/etc/issue.net