I know you guys are going to work on Horde mode at some point, and I have a few suggestions. Currently Horde mode is long, tedious, boring, and fairly difficult in later waves if you don't resort to cheesing the AI. I think borrowing a page from Killing Floor 2's book would fix these problems;
-Less enemies at a time. Waves are broken into mini-waves, so you aren't overwhelmed, but still kept on your toes. Instead of fighting 60 men at a time, you'll be fighting a constantly-refreshing 20 or 30 at a time. This would reduce the amount of kiting necessary in order to survive at later waves. Kiting is f**king boring to watch and it can take way too long.
-Fewer, but larger waves. Instead of 21 waves of 60 enemies , how about 10 waves of 120 enemies? If you break them into mini-waves (as noted in the previous point), it won't be overwhelming, and won't take as long, since less kiting will be necessary.
-Smaller Arenas. For example, on Feitoria, instead of using ...