Its not a 'best' list as such, as per the thread explanation: Its an easy transition list of popular OOTB software, mainly GUI driven, . Mplayer requires a front end selection for a start. I cant add everything, there are thousands of pieces of cool software for Linux, hence the arch software link.
From their website
There are many variants.
MPlayer-VAAPI — VAAPI-enabled version
http://gitorious.org/vaapi/mplayer || mplayer-vaapi
MPlayer-svn — Development version
MPlayer2 — Fork of MPlayer
http://www.mplayer2.org/ || mplayer2
MPlayer2 — Fork of MPlayer (development version)
http://www.mplayer2.org || mplayer2-git
Then there are the GUI's
Deepin Media Player — Rich GTK2/Python interface for the Deepin desktop.
http://www.linuxdeepin.com/ || deepin-media-player
GNOME MPlayer — Simple GTK+-based GUI for MPlayer.
http://kdekorte.googlepages.com/gnomemplayer || gnome-mplayer
KPlayer — Multimedia player for KDE4 using mplayer as a backend.
http://kplayer.sourceforge.net/ || kplayer
KMPlayer — Video player plugin for Konqueror and basic MPlayer/Xine/ffmpeg/ffserver/VDR frontend for KDE.
http://kmplayer.kde.org/ || kmplayer
Rosa Media Player — Multimedia player based on SMPlayer with clean and elegant UI.
http://www.rosalab.com/ || rosa-media-player
SMPlayer — Qt multimedia player with extra features (CSS themes, YouTube integration, etc.).
http://smplayer.sourceforge.net/ || smplayer
Xt7-Player — Graphical user interface for MPlayer written in Gambas, with a huge list of features.
http://xt7-player.sourceforge.net/xt7forum/ || xt7-player
VLC is GUI driven, themeable , multiformat good to go extremely well know cross platform player.
All out of the box.
Again, Its not a "you should only use this list" Mplayer is amazing, its also on the Arch Software link. If it really grinds that much I will add it no problem :P