It's good for the one person you are carrying and bad for all the teams that you are beating to get there.
Everytime you win you are potentially stopping 3 players who have never been to the lighthouse.
I don't think the people who are whining about a scrub seeing the lighthouse have a point. But the truth is you are bumping out a lot more people than you are helping.
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They'd be doing the same if they weren't carrying. If anything, carries limit teams to where it's more difficult to beat consistent, organized ones