ACB Assassinate has that "merciless" even more. You start a chase and kill him? Off the compass with that player for the rest of the match!
And contested kills are just annoying. Even the best players can approach their targets with nothing but pure stealth and still be caught. I learned myself never to go for a target alone, but always use a blend group whenever I can. Even then, the whispers will let my target know I'm coming and when the only thing approaching is a blend group, it only makes sense to throw a smoke bomb and look for stun prompt.
But I'm not gonna keep complaining about ACR. It has it's charms, but not enough for me. So I went back to ACB. If you don't like a game you just don't play it, right?
I never really bothered using Wall Runner because I thought it was bad to go on the rooftops. But I'm experimenting with it now and BOY DO I LOVEEEEEE IT! There's nothing wrong with running on the rooftops all the time as long as you calm down before finding your target and set up a good kill. It's only annoying when people run the whole time to start chases, because of their ignorance that kills are everything. I love it when people go up on the roofs, easy drop kills > !