If marksmen were good for team fight damage OR siege it would not be an issue.

It is the fact that they are godly for DPS in team fights which is why assassin have always has to target them unless way behind. And this threat to marksmen is getting nerfed.

On the other hand if marksmen were just the "siege bitch" who is good for taking objectives but not the best damage in team fights necessitating focusing them this whole issue of marksmen being too good would disappear.

Their versatility and consistently reliable damage threat as well as the fact that anything which so dares to even try and challenge their place in the game (mord anyone?) gets nerfed or deleted is why it is why this class is a problem.

The fact that constant requests for better counterplay to marksmen early game is responded with more mastereis that will clearly help marksmen more then melee is just adding to the frustration of this issue.