"Horde" mode? Do you mean like one versus a hundred in a single map type?
Personally I was thinking of a team of six going up against waves of alien AI, your team needs to defend the base and you can buy improved weapons/defenses as the hardness levels progress.
![Smile :)](http://gamesas.com/images/smilies/icon_e_smile.gif)
That would be impressive and wickedly fun, but I do know one game that supported that type of challenge. AvP (2010) the one were your just a marine versus and unlimited number of aliens with new weapons springing up as you progress. Yet, for Crysis 2 it would be worth it....
![Wink ;)](http://gamesas.com/images/smilies/icon_e_wink.gif)