Why they bothered? 1) Less lag 2) Fewer idiots 3) Consistent rewards. 4k XP and Requisition, 12 AP for Normal run to wave 10. 8K XP and Requisition, 24 AP for Hard run to wave 10. Try getting that in every PVP game if you are a casual player. 4) A change of pace. Not really hard or a gear check like PVP. Even if you only have the basic kits, you can do well if you play as a team. I have gone to wave 9.5 on Hard with 2 players regularly. There is something to be said for slaughtering mindless beasts in job lots sometimes. Not everyone is going to like it, but then again, not everyone likes PVP. Especially in this game with gear being more important than player skill. Not everyone has a totally high end gaming machine to play the game on either and this mode is far easier on low end machines. Besides, comparing EC to Space Marine is like comparing apples and oranges. Yeah, sure, both are 40K Third person shooters. That is where the similarities end. It is easy to look back on Space Marine and go 'Oh, yea that was good' and forget the messes that were involved. Grudge kills... OMG the Grudge kills... Still 20 short.