It's respawns fault. When the most powerful gun is a three shot kill with a fast fire rate and easy to spam lack of skill weapon that has unlimited range and still beats smgs at close range then it's going to encourage people to stay on rooftops and camp. If respawn wanted people to play the game it's designed to be played then they would nerf the hell out of the g2 and r201/101 and reward people who actually run and gun.