If used right they are. There are plenty ways to not get killed by a thorn, use red death, stay at a distance with a scout rifle. Two ways right there Ive survived not having a thorn up until the week before HoW. Just because you can not handle different play styles doesn't mean other play styles need a nerf. If thron gets nerfed people will move on to another "powerful" weapon.
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It's ok for some weapons to be better than others. It's always going to be that way but thorn stands way out above the crowd
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Red death does as well, TLW. Before the thorn I used suros, bad juju and did fine. Even with the word of crota I was doing fine. People complain about it being overpowered because they havent heard of a thing called cover.