Great game, not to mention free.
Graphics:
The graphics are alright. 'Nuff said.
Sound:
The music in this game can get annoying at times, but it is possible to turn it off and listen to your own if you want.
Gameplay:
The commander is the main leader of the team, the commander tells the units(real people) where to go and what not. As the commander upgrades the upgrades become available to the players to siege the enemies base. Horde vs Humans. The horde specialize melee mostly, while the humans specialize in long range. People say it is unbalanced, it is not. The horde has the ability to leap, while the humans have the ability to block. Which makes it balanced.
People get turned off because they try commander when they are newb in a big server, so everyone gets pissed. Try starting off commander in a small server, and ask if you could practice there.