Jhin takes it because he has an insane amount of AD. And his spaced out poke is optimal for the mastery. He abuses everything on the mastery except for the AP ratio.

A good mastery if burst isn't your forte or if you can consistantly maintain it's effect on the enemy. If you are able to use many abilities frequently then this can outscale Thunderlord's Decree in damage but that's not always the case.

Some champions take this because "there just aren't any better options" like Jhin, even though it wouldn't proc much it still works quite well with his high poke / spaced out attacks playstyle.

Teemo has interesting confliction with this mastery, even though it's better in the late game []Thunderlord's Decree]] offers much higher lane bullying power.

To conclude this talent can be better if you are able to maintain it's uptime, people like Brand have a great time as it's easy to apply to multiple targets in fights can is refreshed by his passive

Well I guess your opinion got rekt by the community.

Damaging abilities don't say much although I have been though it works well for mages with lingering spells ex: the champion on your guide.