I have enjoyed every week's challenge, but I think this week's horde thing is most difficult one.
I have tried 5 times and lost 2 points was my best result.

I want to know other players' tactics.
mines are usually

-wait at hive spawn point with 2~3 miniguns, one officer. another one for collecting BP boxes.
-after buying DLC, I think shotgunners with reinforcement & 20 ammo can be good strategy.
(cheap soldiers keep providing ammo.)

also I am curious about detailed point system like I lost my point if I change class of a marine.
anyway, I do enjoy this challenge (some points are very annoying like diversion mutation or poison gas thing, but I understand it also makes game fun)