I like to think it gives me a general idea on what I'm up against or partner with. Sure you can have bad games, but K/D is an average of your overall playstyle. I'll make a scenerio. For the purpose, let's say we are playing clash, so no objectives can get in the way as a variable. Suppose I have a 1.0 K/D. Pretty standard. Nothing too good but not too bad. And I like to rush in and attach aggressively. I'm up against something who has a 1.9 K/D. This can mean two things. He either camps in the back and waits for people or he rushes in and knows how to play those situations. This gives me an idea on how to prepare either scenerio. Say he's a rusher. I rush in, but I get destroyed every time its 1v1. The game ends with me getting 4 k 11 d and him getting 17 k 6 d. Say he's a camper but I know how to deal with those types of players. I wreck him and continue to do so. We end the game with me getting 11 k 8 d and him getting 6 k 14 d. It allows you to predict how each player can play. Now say I go play 8 more games. I get (respectively in K/D) a .3, .5, 3.33, 1.76, 1.2, 1.06, 7.33, and a 1.0. Overall you would see I'm a pretty average player with some outliers. But thats it. Just outliers. As an average player, you can predict how each player can potentially and use it to your advantage. TL;DR yes, I think it is important. It does matter to give you information. But I also think that W/L is important too. I think players should be judged to an extent.