I just feel like a lot of other people feel about the Nader Merc, OP! Explosives in DB are just so powerful that the Nader is just unbelievably too strong. Maybe reduce the amount of grenades? Idk. Just take this into consideration.
Nader Problems
Um…no, I really don’t know where people get that she’s too strong when you consider that
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Fragger’s Nades have a bigger radius AND deal more damage, even though they don’t explode on direct contact, they are definetely more effective.
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Nader’s Nades only deal 90 damage on direct hit, aoe radius is actually pretty short so falloff damage takes effect rather quickly. So asuming you don’t hit your directs, you’ll need about 3-4 nades in a good spot to clear out an enemy’s nest. You won’t kill anything but the sentry, healing, or ammo station in most cases. Unless a light merc refuses to move or someone is lit.
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Her SMG’s are strong, but her main ability means you have to rely on them a lot in open areas, where Skyhammer and Fragger will outmatch you with the M4. And against Bush and Sawbonez it’s a matter of team work. If you face them 1 on 1 you’ll be fine. More than that, good luck.
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To sum it up, she’s only too strong if you’re really bad at dodging aoe, or if the Nader is really good at landing direct hits. And even then that takes considerable effort, so it’s far from op. Reserve that term for something that’s completely skill less and changes the game every time it’s used.
Nader was nerfed before, no? I played her in closed and am pretty sure she had more nades. Newer nader players will “blow their load” early with her and have to sit and wait for her nades to recharge. A solid nader will use the nades to move the cockroaches out of their nest so that the SMGs can start doing their work (the nader included). Martyrdom is easy to get around, juke the nader by acting like you’re moving forward to knife them and they’ll usually go boom when you back up 
Being a nader player myself, I too, still fall for martyrdom in the heat of the moment
I think nader is alright where she is now. We will have to see what happens with new characters on release. She’s been around long enough for us to understand her and how to deal with her.
As salty as I get at being killed by a Nader, I really don’t think she’s THAT bad. I wouldn’t mind a .8-1 second delay on her Martyrdom though. I’ve been Allahu Akbar’d more times than I can count.