Why do people think it's OP? You use a melee and a grenade to get a kill. That seems fair enough. I don't hear people complaining about Sticky grenades and they kill you in one shot without the use of a melee. It's not that hard to get out of either, unless your directly in the middle and in that case the fella who got you simply did a good job. So I'm a bit curious as to what makes people think it's OP? Perhaps it's something I'm not seeing.
[spoiler]Now before people say that I main a Hunter and that I use this "wombo combo" I just have to say that I use Nightstalker because of my dream to one-day be able to get a group of enemies tethered (while I have bloodbound) and actually get the kills NOT for some melee grenade combo. I hardly ever get lucky enough to tether a large group of enemies and when I do I end up getting killed before I land :([/spoiler]
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It is not OP. People calling it OP don't know how to dodge.