I already know a lot of people on here don't feel the same way, but I have the most fun by winning. Playing just to get a high k/d is too easy, so it gets boring after awhile. It's like playing Madden on the easiest difficulty and winning every game 100-0. About the 3-4-5 setup, I use that almost all of the time except for killstreak challenges, and I still have the highest k/d on my friendslist.