I think a big part of my satisfaction from playing games where you shoot other people online comes from knowing that when I kill somebody, I am accomplishing something.
When I kill somebody in base, I know that they might even be respawning in their base, naked, where my team's base rapist is going to man handle them. I can guess that it's going to be a long while before they are back in my face again, cus I killed them. Having reset them on the other side of the map, with no energy pack and limited weapons, I felt that killing them mattered.
In arena, when you kill somebody, they are dead, it mattered that you killed them. Killing them was like a rush of satisfaction.
In LT, killing people often means very little when they can disc jump and be back at your position in 3 seconds with a full loudout of weapons ready to go.
Often when I play defense, I am thinking "Oh, I should just leave that guy wounded in the red", "Killing him will only bring him back to my base in full health in 7 seconds, so this way I can just wait until our flag is returned and then finish him off to make him the least effective possible."
And often when I kill people I end up essentially only teleported them into a far better position and situation than they were in before I killed them.
Due to the severely decreased penalty on death, it really takes so much of the satisfaction for me out of the game. I can't get a rush from killing people unless I know it's at a crucial moment.
Playing LT is like trying to get high off of low quality weed.