Why going 18/15 is actualy bad.
So you went 18/15 in the last game. You wonder why you lost your game even doe you were positive. And complain because you are usually paired with trash players who can't help you win the game and are too hard to carry. Let me explain you why it might as well be partially your fault.
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You have the most kills in the game and therefore you're the highest level. Because of that, you worth more experience for each of your death then the experience you get from each kills.
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You probably had kill streaks and gave more gold because of it then what you personally got. You are highly likely to have killed that poor support 3 time in a row and you had very few gold from him.
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Every time you die and you do that a lot sadly, even if you killed someone else with you. That guy likely had less experience they you. This mean the experience you distributed in between the other opponents is now putting your whole team into an unfair disadvantage. Your 15 deaths probably made very single of your opponents 2 level higher then what they should have been. Unless you are lucky and someone else in your team is carrying hard, when you die it's a losing situation for your team. and you DO die a lot.
tldr; When you are ahead, you have the most gold and the most experience you should consequently be the one of your team who die the least. If you don't you did something wrong.