I voted 9, seeing as how nothing can be the absolute best. If you vote 10, that means that there are no flaws. Everything has its flaws.
I play other games, but often get bored of them and just go back to playing Tremulous. That is why I gave it a 9, because I know it will be a lasting memory in my life as a gamer, much like how Wolf: ET, Super Metroid, Super Mario World, Starcraft, Descent, Super Smash Bros., and Roller Coaster Tycoon have.