One, I know of the wombo, it's a little too powerful, but only by a tiny bit, and I see top tier players saying it's overpowered all the time. I'm not saying nerf it into the ground, I'm saying make it take skill. Have the damage be based on proximity to the grenade. Just because you can counter something doesn't make it fine. I could counter thorn year one easily, but that didn't make sitting in a corner every time I got tagged fun, because it slows down gameplay, and no matter how long the burn is, the point remains it forces you out of the fight and allows you to be an easy kill even if you are almost out of its radius. The easier a grenade is to hit you, the less it should do. For example, incendiary grenades are fine, because they require perfect placement for a one hit kill and the farther you are from it, the less it does.