Okay, so as we know thunder used to be so bad he was considered a joke. However, now he is considered one of the most op mercs in the game. He has been banned from many competitive matches because of this.
His concussion grenade can concuss anyone within a radius so even if you look away, you will still get concussed. This is by far one of the most powerful abilities in the game as it slows players down by a drastic amount and also blinds people for a long period of time.
In addition to this overpowered ability he has also been given the stark. Meaning he can easily head shot the slowed enemies. And since the stark is so powerful it only takes 2 bursts to kill an enemy.
Even if thunder doesn’t kill you. There’s a great possibility that someone else will kill you as you are essentially standing still for a period of up to 6 seconds.
Also this concussion grenade is probably the worst thing to die from as you are left pretty much helpless to fend of enemies and there is hardly any skill required to throw an effective concussion grenade, the most annoying thing about this is that it is pretty much unavoidable. The ridiculously small cool down on the ability allows it to be spammed quite often.
So please Splash damage, fix this broken merc.