Hahaha...
this turn out good if you meet someone who is also very stubborn ^^and when people are walking on the wrong side of the walkway.
I really can imagine how it'll look like if 2 people walk into each other and fall to the ground.
but that aside, it's better if they don't throw more enemies at you... it would totally destroy the "tactical"-aspect in the game... go from cover to cover and so on. (even though GoW is far less tactical than GRAW or Las Vegas etc.)
so, making them harder to kill and you easier to die will do the job a lot better.
So I doubt that more to kill will always equal more fun.
For me it's a lot more fun if the enemies become really challanging and you have to watch out what you do and mistakes nearly always result in death.