In my opinion, Thorn is no more dangerous than any other primary. If it's a 1v1 gun fight, it can be won 8/10 times by a non-Thorn user. If you're getting team-shot by 2 or more Thorns, then yeah, you're going down, but that's no different than being team-shot by any other primary or combination of primaries. All the Thorn drama is redundant.