Unfotunately there are few games, outside of the MMORPG realm, that are strictly multiplayer. How would we flag the single-player games with multiplayer components? Oh nevermind...
Why play along? I get where you are going. However, I think the forums make sense the way they are. The multiplayer forum is basically a place to set up meetings for multiplayer games and talk about MMORPG's. Weed out the Xbox Live noise and pretend it says "MMORPG Discussion."
Anyway, this should probably be in Site Feedback forum. I find the irony delicious!
Copious smileys so you don't take it so seriously: