I would really love to see a mod where 100 players, would fights against "alien like" waves of enemies (to change from the eternal zombies).

Make a 5 minutes initial preparation to build defenses
Then a 3 minutes break between waves to build more and heal players

The game would go on a 20 waves to win the match
With a maximum of X tickets

With each new wave of enemies, the aliens would become more powerful, and new units would appear.
Stronger uglier and bigger ones
Saucers for having fun with our AA
“walkers” a bit like in the War of the Worlds, so that our tanks and our ATs do their job.

and I'm sure we'd all have fun together for once, without pulling on each other


...The AI doesnt have to be very clever, the number would do it.
Yet, I dont know how the server could handle the hordes of ennemies. But surely, it would be fun.

Long time ago, there was a modf on unreal tournament (2004 I believe) that was a co-op VS ennemy waves of monsters - with some RPG elements. IT was 100% super fun.